Source: https://patents.google.com/patent/JP3580803B2/en
Timestamp: 2020-08-05 14:35:03
Document Index: 301534555

Matched Legal Cases: ['art 40', 'art 40', 'art 40', 'art 40', 'art\n40', 'art\n40', 'art\n45']

JP3580803B2 - Semiconductor device - Google Patents
JP3580803B2
JP3580803B2 JP2002233762A JP2002233762A JP3580803B2 JP 3580803 B2 JP3580803 B2 JP 3580803B2 JP 2002233762 A JP2002233762 A JP 2002233762A JP 2002233762 A JP2002233762 A JP 2002233762A JP 3580803 B2 JP3580803 B2 JP 3580803B2
JP2002233762A
JP2004079579A (en
2002-08-09 Application filed by 沖電気工業株式会社 filed Critical 沖電気工業株式会社
2004-03-11 Publication of JP2004079579A publication Critical patent/JP2004079579A/en
2004-10-27 Publication of JP3580803B2 publication Critical patent/JP3580803B2/en
239000004065 semiconductor Substances 0.000 title claims description 105
The present invention relates to a semiconductor device having a package structure, and particularly to a semiconductor device having a WCSP type.
With the increasing demand for higher integration of semiconductor devices mounted on electronic devices and higher frequencies of transmission signals, CSP (CSP), a semiconductor device packaged with an outer size almost the same as the outer size of a semiconductor chip. Chip Size Package) is attracting attention.
In recent years, in particular, for the purpose of reducing the manufacturing cost and the like, the technical development of a WCSP (Waferlevel Chip Size Package), which is a CSP singulated by dicing, by completing the steps of forming external terminals in a wafer state, has been advanced. Has been.
In the WCSP, an electrode pad on a semiconductor chip and an external terminal are arranged so as to relocate the external terminal to a desired position.line(Redistributionline)Some have a structure electrically connected via a.
Such redistributionLineHave WCSPs redistributedOn the lineTherefore, the degree of freedom in wiring design is improved.
Redistribution described aboveLineWhen transmitting a high-frequency signal using the WCSP, a circuit element included in the semiconductor chip and a signal line electrically connected to the circuit element via an electrode pad, that is, a redistribution signal,Lines andIt is desirable to match the impedance of both.
By overcoming the impedance mismatch between the two, the attenuation of the transmission signal due to the reflection of the transmission signal generated near the junction between the electrode pad and the signal line can be suppressed.
However, despite the fact that the characteristic impedance of the signal line in the WCSP is sufficiently larger than the impedance of the circuit element, an effective method for reducing the characteristic impedance of the signal line and achieving impedance matching between the two has been proposed. Not been.
SUMMARY OF THE INVENTION An object of the present invention is to achieve impedance matching between the impedance of a circuit element and the characteristic impedance of a signal line electrically connected to the circuit element, thereby reducing reflections and the like that become conspicuous as the transmission signal becomes higher in frequency. An object of the present invention is to provide a semiconductor device having excellent high-frequency characteristics in which generation is suppressed.
Therefore, the semiconductor device of the present invention has the following structural features.
That is, the semiconductor device of the present invention has a configuration in which a semiconductor chip including circuit elements is packaged, and the outer dimensions of the packaging are substantially the same as the outer dimensions of the semiconductor chip. Have. A plurality of electrode pads are formed on the semiconductor chip, and a plurality of electrode pads are formed on an insulating film provided so as to expose a part of the surface of the electrode pad and at a position different from the position immediately above the electrode pad. External terminals for external connection are formed. Each of the electrode pads and each of the external terminals are arranged on the insulating film.LineAre electrically connected via This distributionThe line is, First and second distributionLineIncluding the first distributionThe line isThe ground line, that is, the GND line, and the second wiringThe line isIt functions as a signal line through which an electric signal having a voltage based on the ground voltage is transmitted. And this first distributionThe line isSecond distributionLineIt is provided at a position to sandwich.
According to this configuration, the signal line is connected to the first line.LineIn other words, since it is provided at a position sandwiched between the GND lines, electromagnetic coupling between the GND lines and the signal lines is strengthened. As a result, the capacitance between the GND line and the signal line increases, and the inductance of the signal line decreases, so that the characteristic impedance of the signal line can be reduced as compared with the related art.
Further, unlike the configuration in which the first and second external terminals are provided on the same insulating layer described above, the first external terminal is provided above the lamination of the first and second insulating layers provided on the semiconductor chip. In the case where the second external terminal is provided above the second insulating layer, the connection between the first electrode pad and the first external terminal is extended over the second insulating layer. Of the ground wire, that is, the first wire that becomes the GND wire.By lineThe connection between the second electrode pad and the second external terminal is made by a second wiring which extends on the first insulating layer and becomes a signal line.By lineDone, and the first distributionBy lineSecond distributionLineIt is configured to cover from above.
According to this configuration, the first and second distributionsLineSince the structure is a microstrip line structure, the characteristic impedance of the signal line can be reduced as compared with the conventional one, and since the GND line is arranged farther from the semiconductor chip, the connection between the GND line and the circuit element in the semiconductor chip can be reduced. The occurrence of undesired interaction between them can be suppressed.
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. Each drawing schematically shows a configuration example of a semiconductor device according to the present invention. Further, the drawings merely schematically show the shapes, sizes, and arrangements of the components to the extent that the present invention can be understood, and the present invention is not limited to these illustrated examples. Also, for the sake of simplicity of the drawing, hatching (oblique lines) showing a cross section is omitted except for a part. In the following description, specific materials and conditions may be used, but these materials and conditions are merely one of preferred examples, and are not limited thereto. Further, in each of the drawings, the same components are denoted by the same reference numerals, and the duplicate description thereof may be omitted.
In each embodiment described below, each CSP obtained by cutting out a CSP in a wafer state by dicing will be referred to as a WCSP, and the WCSP will be described as an example of a semiconductor device.
A semiconductor device according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a plan view schematically showing a WCSP 10, which is a semiconductor device according to this embodiment. FIG. 2A is an enlarged view of an area A surrounded by a broken line in the plan view shown in FIG. 1 to show each component in detail (in each of the following embodiments, FIG. Are omitted, and description will be made with reference to the figure corresponding to this enlarged schematic view.) FIG. 2B is a view of a cut (cross-section) obtained by cutting FIG. 2A along a broken line I-I ′ line as viewed in the direction of arrow I in the figure. FIG. 2C is a view of a cut (cross-section) obtained by cutting FIG. 2A along the broken line portion PP ′ as viewed in the direction of arrow P in the figure (the following embodiment). The same applies to the embodiment described above.) 1 and 2A, for the sake of convenience, the illustration of a sealing film 50 such as an organic resin film included in the WCSP 10 is omitted, and in FIG.Line 35 and a part of the post part 40 are also not shown.
The electrode pads 20 made of aluminum (Al) are arranged at predetermined intervals along the outer periphery of the semiconductor chip 15 on the semiconductor chip 15 provided in the WCSP 10 as a semiconductor device. In the example shown in FIG. 1, since the planar shape of the WCSP 10 is a square, the electrode pads 20 are arranged linearly along each side of the square. The number and positions of the electrode pads 20 are not limited to this, and, for example, only one set may be opposed to the semiconductor chip 15.
As shown in FIGS. 2A and 2B, insulating layers such as a passivation film 25 and a protective film 30 are formed on a semiconductor chip 15 having circuit elements so that the surfaces of the electrode pads 20 are exposed. (Here, this insulating layer is also referred to as a first insulating layer.) 32 is sequentially provided. The passivation film 25 is, for example, a silicon oxide film (SiO2), And the protective film 30 is formed of a low-hardness film material such as a polyimide resin. Delamination due to the stress of
Further, as shown in FIG. 2A, each electrode pad 20 (20a, 20b) has its own dedicated arrangement.Line 35 (35a, 35b) are electrically connected to the corresponding post portions 40 (40a, 40b) respectively. This distributionLine 3Reference numeral 5 extends over the protective film 30 in the direction of the center of the semiconductor chip 15 and is formed of copper (Cu).
More specifically, the arrangement in this embodimentLine 35 is the distributionLine 35 are connected to the electrode pads 20 corresponding toLine 35, a post portion 40 is formed on a surface extending on the first insulating layer 32.
As a result,Line 35, a solder ball (bump) (not shown), which is an external terminal for connecting to the mounting board, formed on the post portion 40 is placed at a desired position on a substantially horizontal plane regardless of the position of the electrode pad 20. That is, it can be arranged at a shifted position above the semiconductor chip 15 from a position immediately above the electrode pad 20. Therefore, this distributionLine 35 is the rearrangement which enables the rearrangement of the external terminals.Lines andFunctioning (hereinafter, distributionLine 3Redistribute 5Lines andMay be referred to).
As shown in FIGS. 2B and 2C, a sealing film 50 such as an epoxy resin is provided on the upper surface side of the semiconductor chip 15 so as to cover the passivation film 25 and the protection film 30 and the like. The posts (40a, 40b) are formed so as to expose the surfaces thereof. The posts (40a, 40b) are connected to solder balls 45 as external terminals, which are bumps for connection to a printed circuit board (not shown).
The arrangement shown in FIG.Line 35, the two first arrangementsLine 3Each of 5a and 35a makes a connection between the first electrode pad 20a, 20a and the first post portion 40a, 40a, respectively. Furthermore, the second distributionLine 35b makes a connection between the second electrode pad 20b and the second post portion 40b. 1st distributionLine 3Since 5a and 35a are supplied with a ground (GND) potential, they are also referred to as GND lines or GND layers. In addition, the second distributionLine 35bIs supplied with an electric signal of a voltage based on the GND potential, that is, a high-frequency signal (variable potential signal), and is also referred to as a signal line or a signal layer. In this configuration example, the high frequency means the frequency of a signal transmitted through a signal line having a length that does not become extremely short with respect to the effective wavelength of the operating frequency of the semiconductor chip.
In this case, a pair of first arrangementsLine 35a, 35a, the second distributionLine 35b are arranged on the upper surface of the protective film 30 so as not to contact each other.
Thus, these arrangements shown in FIG.LineThe connection structure includes first and second distributions.LineWhen viewed two-dimensionally, two first arrangementsBy lineSecond distributionLineIt has a coplanar line structure arranged so as to sandwich it from both sides.
In this coplanar line structure, since the signal line 35b is provided at a position interposed between the GND lines 35a, electromagnetic coupling between the GND line 35a and the signal line 35b is enhanced. As a result, the capacitance between the GND line 35a and the signal line 35b increases, and the inductance of the signal line decreases, so that the characteristic impedance of the signal line 35b can be reduced as compared with the related art.
Therefore, according to the inventor according to the present invention, the matching between the reduced characteristic impedance of the signal line 35b and the impedance of the circuit element is particularly realized by the reallocation.By lineIt has been found that it can be obtained by considering the arrangement position of a certain GND line 35a.
The matching between the characteristic impedance of the signal line 35b and the impedance of the circuit element mainly depends on the width of the GND line 35a (indicated by A in FIG. 2C) and the width of the signal line 35b (in FIG. 2C). B.), the thickness of the GND line 35a (d in FIG. 2C).1Indicated by ), The thickness of the signal line 35b (d in FIG. 2C).TwoIndicated by ), The horizontal spacing between the GND line 35a and the signal line 35b (indicated by C in FIG. 2C), the arrangement.Line 35 resistivity ρ (here, distributionLine 35 is made of copper (Cu). ), Conductive portions on the semiconductor chip 15 (arrangement)Line 35, the dielectric constant ε of the dielectric layer around the electrode pad 20 and the post part 40 (here, the dielectric impedance of the epoxy resin 50 between the signal line 35b and the GND line 35a greatly affects the characteristic impedance of the signal line 35b). Rate ε), and the thickness of the surrounding dielectric layer (here, epoxy resin 50) (d in FIG. 2C).ThreeIndicated by ) Can be adjusted and taken. In addition,Line 3When the forming material of No. 5 is a magnetic material, it is desirable to also consider the magnetic permeability.
In the configuration examples shown in FIGS. 2A to 2C, the first and second electrode pads 20a, 20b, and 20a are linearly juxtaposed, andLine 35a, 35b, 35a linearly extend from directly above the electrode pads to the respective post portions 40a, 40b, 40a in a direction perpendicular to the arrangement direction of the electrode pads. Therefore, the width of the signal line 35b (indicated by B in FIG. 2C) here is the contact of the signal line 35b with the second electrode pad 20b of the signal line 35b when viewed in plan in FIG. 2A. The signal line portion (the portion indicated by L in FIG. 2B) between the portion 351 (see FIG. 2B) and the contact portion 352 (see FIG. 2B) with the external terminal 40b is an electrode pad. Are shown in the array direction. Similarly, the width of the GND line 35a (indicated by A in FIG. 2C) indicates the width of the GND line portion corresponding to L in FIG. 2B in the arrangement direction of the electrode pads.
Therefore, for example, when it is desired to set the characteristic impedance of the signal line 35b to about 50 [Ω], which is substantially the same as the impedance of the circuit element included in the semiconductor chip 15, for example, A = 200 [μm] and B = 40 [ μm], d1= 5 [μm], d2= 5 [μm], C = 23 [μm], ρ = 1.67 × 10-6[Ωcm (20 ° C.)], ε ≒ 4 [F / m] and d3= 90 [μm].
As described above, the width of the GND line and the signal line and the interval between the GND line and the signal line are determined by the resistivity of the material forming the GND line and the signal line and the dielectric constant of the dielectric layer filling the gap between the GND line and the signal line. The value depends on.
With the above-described setting conditions, the characteristic impedance of the signal line 35b can be set to about 50 [Ω]. Therefore, the impedance mismatch between the signal line 35b and the circuit element included in the semiconductor chip 15 can be achieved. Can be overcome.
That is, in the present embodiment, the wiring provided so far for rearranging the external terminals is provided.On the lineOn the other hand, a function for reducing the characteristic impedance of the signal line is further added.
As is clear from the above description, in this embodiment, the matching between the characteristic impedance of the signal line 35b and the impedance of the circuit element included in the semiconductor chip 15 is realized.
Therefore, transmission of a high-frequency signal can be efficiently realized, and a semiconductor device having higher-frequency characteristics than a conventional device can be obtained.
In this embodiment, the first point is that the width (= A) of the GND line 35a and the interval (= C) between the GND line 35a and the signal line 35b are set to be narrower than those in the first embodiment. This is the main difference from the embodiment. In addition, the same components as those already described in the first embodiment are denoted by the same reference numerals, and specific description thereof may be omitted (the following embodiments are also described). Similar).
A passive element such as a coil or a capacitor is formed on the upper portion of the semiconductor chip 15 to which a high-frequency signal is transmitted (not shown). Such passive elements are provided in the post section 40 and the arrangement.Line 3In some cases, the operation of the integrated circuit included in the semiconductor chip 15 may be unstable due to the influence of the electromagnetic field radiated when a current flows through the semiconductor chip 15.
Therefore, as shown in FIGS. 3A and 3C, in this embodiment, the redistribution in the first embodiment is performed.LineThe width (= B) of the signal line 35b and the distance (= C) between the GND line 35a and the signal line 35b are the same or almost the same as those in the first embodiment, but the width (= B) of the signal line 35b = B), the width (= A) of the GND line 35a, which has been significantly wider than that of (B), is further reduced.
However, the electromagnetic coupling between the GND line 35a and the signal line 35b is weakened by reducing the width (= A) of the GND line 35a. Therefore, the charge capacity between the GND line 35a and the signal line 35b decreases, and the inductance increases.
As a result, the characteristic impedance of the signal line 35b is increased by reducing the width (= A) of the GND line 35a because the characteristic impedance of the signal line is the square root of the value obtained by dividing the inductance by the capacitance.
Therefore, in this embodiment, the interval (= C) between the GND line 35a and the signal line 35b is set to be narrower than that in the first embodiment, thereby suppressing an increase in the characteristic impedance of the signal line 35b. I do.
Therefore, for example, when it is desired to set the characteristic impedance of the signal line 35b to about 50 [Ω] which is almost the same as the impedance of the circuit element included in the semiconductor chip 15, for example, A = 100 μm, B = 40 μm, d1= 5 [μm], d2= 5 [μm], C = 22 μm, ρ = 1.67 × 10-6[Ωcm (20 ° C.)], ε ≒ 4 [F / m] and d3= 90 [μm].
With the above setting conditions, it is possible to overcome the impedance mismatch between the signal line 35b and the circuit element included in the semiconductor chip 15.
As is apparent from the above description, in this embodiment, the same effect as in the first embodiment can be obtained.
Further, in this embodiment,By lineUndesired interaction between a certain GND line 35a and an integrated circuit provided in the semiconductor chip 15 is suppressed, and a more reliable semiconductor device can be obtained.
A semiconductor device according to a third embodiment of the present invention will be described with reference to FIG.
This embodiment is different from the first embodiment in that two GND lines 35a and 35a are further provided so as to surround a signal line 35b.
In order to further reduce the transmission loss of high-frequency signals, not only the signal lines 35b but also conductive portions formed on the semiconductor chip 15 (for example, the electrode pads 20, the post portions 40 and the solder balls (external terminals) It is desirable to match the characteristic impedance of each component of (45) with the impedance of the circuit element.
Therefore, as shown in FIG. 4A, in this embodiment, in the first embodiment, two GND lines 35a, 35a located at positions sandwiching the signal line 35b from both sides in a two-dimensional arrangement relationship. The end not connected to the first electrode pad 20a, that is, the end connected to the first post portions 40a, 40a is connected to the signal line 35b and the second post portion 40b connected to the signal line 35b. Are connected so as to surroundLines andI do.
Therefore, for example, when it is desired to set the characteristic impedance of the signal line 35b to about 50 [Ω], which is almost the same as the impedance of the circuit element included in the semiconductor chip 15, for example, as in the first embodiment, The setting condition of the portion is determined (see FIG. 4C), and further, the GND line 35a is formed in a U-shaped integrated structure from one electrode pad 20a to the other electrode pad 20a, and the GND line 35a is formed. At 35a, a signal line 35b and a second post 40b connected to the signal line 35b are provided so as to surround in a U-shape. Further, each of the first post portions 40a can be connected in the middle of the U-shaped GND line 35a.
As a result, as shown in FIGS. 4A and 4B, as compared to the first embodiment, the GND line 35a extends over a wider area near the second post portion 40b connected to the signal line 35b. Be placed.
As described above, by setting the width and the interval between the GND line 35a and the signal line 35b to be the same as the above-described setting conditions, it is possible to overcome the impedance mismatch between the signal line 35b and the circuit element included in the semiconductor chip 15. Can be.
Further, in this embodiment, since the characteristic impedance of the post portion 40 is reduced as compared with the first embodiment, a more reliable semiconductor device in which transmission loss of a high-frequency signal is further suppressed can be obtained. .
A semiconductor device according to a fourth embodiment of the present invention will be described with reference to FIG.
In this embodiment, the main difference from the second embodiment is that the GND line 35a is provided so as to surround the signal line 35b, as in the third embodiment. .
Therefore, for example, when it is desired to set the characteristic impedance of the signal line 35b to about 50 [Ω], which is almost the same as the impedance of the circuit element included in the semiconductor chip 15, for example, as in the second embodiment, The setting conditions of the portion are determined (see FIG. 5C), and further, the GND line 35a is formed in a U-shaped integral structure from one electrode pad 20a to the other electrode pad 20a. At 35a, a signal line 35b and a second post 40b connected to the signal line 35b are provided so as to surround the signal line 35b in a U-shape. Further, each of the first post portions 40a can be connected in the middle of the U-shaped GND line 35a.
As a result, as shown in FIGS. 5A and 5B, as compared to the second embodiment, the GND line 35a extends over a wider area near the second post portion 40b connected to the signal line 35b. Be placed.
As is clear from the above description, in this embodiment, the same effect as in the second embodiment can be obtained.
Further, in this embodiment, since the characteristic impedance of the post portion 40 is reduced as compared with the second embodiment, a more reliable semiconductor device in which transmission loss of a high-frequency signal is further suppressed can be obtained. .
A semiconductor device according to a fifth embodiment of the present invention will be described with reference to FIG.
In this embodiment, while the width (= A) of the GND line 35a is set to be narrow, the interval (= C) between the GND line 35a and the signal line 35b is not narrowed, and the GND line 35a is not narrowed. The fourth embodiment is characterized in that the signal line 35b and the signal line 35b are embedded in a dielectric layer having a higher dielectric constant than the sealing film 50 (here, an epoxy resin (dielectric constant ε ≒ 4 [F / m])). This is the main difference from the form.
Thus, in this embodiment, the GND line 35a and the signal line 35b are embedded in a dielectric layer 55 made of a phenol resin (dielectric constant ε ≒ 4.5 to 5 [F / m]) (FIG. 6 (A)-(C)).
By embedding the dielectric layer 55 between the GND line 35a and the signal line 35b, the electromagnetic coupling between them is strengthened as compared with the case where the dielectric layer 55 is embedded in the epoxy resin 50 therebetween.
Therefore, by using the dielectric layer 55, the characteristic impedance of the signal line 35b that is increased by reducing the width (= A) of the GND line 35a can be reduced.
In this embodiment, the dielectric layer 55 is provided so as to cover the entire surface of the semiconductor chip 15 except for the region of the post section 40. However, at least one of the GND lines 35a located at the position sandwiching the signal line 35b. What is necessary is just to be provided so as to embed between the GND line 35a and the signal line 35b over the other GND line 35a. This is because the increase in the capacitance between the GND line 35a and the signal line 35b can be remarkably realized at least by strengthening the electromagnetic coupling therebetween. As a result, the characteristic impedance of the signal line 35b can be effectively reduced.
Therefore, for example, when it is desired to set the characteristic impedance of the signal line 35b to about 50 [Ω] which is almost the same as the impedance of the circuit element included in the semiconductor chip 15, for example, A = 100 μm, B = 40 μm, d1= 5 [μm], d2= 5 [μm], C = 23 μm, ρ = 1.67 × 10-6[Ωcm (20 ° C.)] and ε ≒ 4.5-5 [F / m] and d3= 90 [μm].
With the above-described setting conditions, it is possible to overcome the impedance mismatch between the signal line 35b and the circuit element included in the semiconductor chip 15.
As is clear from the above description, in this embodiment, the same effect as in the fourth embodiment can be obtained.
A semiconductor device according to a sixth embodiment of the present invention will be described with reference to FIG.
The main difference between the third embodiment and the third embodiment is that the GND lines 35a are provided in a mesh shape.
As shown in FIG. 7 (A), the occupation area of the GND line 35a itself can be reduced by forming the GND line 35a in a mesh shape, and thus the rearrangement is performed as described above.By lineUnwanted interaction between a certain GND line 35a and an integrated circuit provided on the semiconductor chip 15 can be suppressed.
Therefore, for example, when it is desired to set the characteristic impedance of the signal line 35b to about 50 [Ω] which is substantially the same as the impedance of the circuit element included in the semiconductor chip 15, for example, A = 20 μm (mesh width), B = 40 μm, d1= 5 [μm], d2= 5 [μm], C = 22 μm, ρ = 1.67 × 10-6[Ωcm (20 ° C.)], ε ≒ 4 [F / m] and d3= 90 [μm].
As is clear from the above description, in this embodiment, the same effect as in the third embodiment can be obtained.
Further, in this embodiment, the GND lines 35a are formed in a mesh shape, so thatBy lineSince undesired interaction between a certain GND line 35a and an integrated circuit provided on the semiconductor chip 15 is suppressed, a more reliable semiconductor device can be obtained.
A semiconductor device according to a seventh embodiment of the present invention will be described with reference to FIG. FIG. 8D is a view of a cut (cross-section) obtained by cutting FIG. 8A along the broken line Q-Q ′, as viewed from the arrow P direction in the figure.
Therefore, as shown in FIG.LineThe structure is such that the GND line 35a covers the signal line 35b via a dielectric layer 60 formed of, for example, a polyimide film (this dielectric layer is also referred to as a second insulating layer) 60, for example. It is a microstrip line structure provided at a position.
More specifically, as shown in FIGS. 8A to 8D, a first insulating layer 32 and a second insulating layer 60 on the first insulating layer 32 are provided on the semiconductor chip 15. . The upper surface of the first electrode pad 20a is exposed from the first and second insulating layers (32, 60), and the second electrode pad 20b is exposed from the first insulating layer 32. Then, the solder balls 45, which are formed on the first and second post portions (40a, 40b) and are external terminals for connecting to the mounting board, are connected to the first and second electrode pads (20a, 20b), respectively. It is arranged at a shifted position above the semiconductor chip 15 from directly above. At this time, the second post portion 40b is provided on the signal line 35b located on the first insulating layer 32. The side surface of the second post portion 40b is covered with the second insulating layer 60 and the resin seal 50. Further, the first post portion 40a is provided on the GND line 35a located on the second insulating layer 60. The side surface of the first post portion 40a is covered with a sealing film 50. The first and second post portions (40a, 40b) are led out to the surface of the sealing film 50 and connected to the solder balls 45 as external terminals, as already described in the first to sixth embodiments. It is connected.
In this configuration example, the signal line 35b connected to the second electrode pad 20b extends on the protective film 30, and thus on the first insulating layer 32, toward the center of the semiconductor chip 15, and is electrically connected to the second post portion 40b. Connected.
On the other hand, the GND line 35a connected to the first electrode pad 20a extends from the first electrode pad 20a in the vertical direction of the first electrode pad 20a and then exposes the surface of the second post portion 40b. It is provided continuously over the dielectric layer 60 covering the semiconductor chip 15 and is electrically connected to the first post part 40a.
As described above, the microstrip line structure provided so that the signal line 35b and the GND line 35a overlap with each other is provided at a position where the signal line 35b is sandwiched between the GND lines 35a, similarly to the coplanar line structure. Therefore, electromagnetic coupling between the GND line 35a and the signal line 35b is strengthened. As a result, the capacitance between the GND line 35a and the signal line 35b increases, and the inductance of the signal line decreases, so that the characteristic impedance of the signal line 35b can be reduced as compared with the related art.
Further, in the microstrip line structure, the GND line 35a is arranged at a position further away from the semiconductor chip 15 than in the coplanar line structure.
Therefore, undesired interaction between the GND line 35a and the integrated circuit provided on the semiconductor chip 15 can be more effectively suppressed.
In this embodiment, the second insulating layer, that is, the dielectric layer 60 is provided so as to cover the entire surface of the semiconductor chip 15 except for the region of the second post portion 40b, but at least at a position covering the signal line 35b. It is sufficient if provided. This is because the increase in the capacitance between the GND line 35a and the signal line 35b can be remarkably realized at least by strengthening the electromagnetic coupling therebetween. As a result, the characteristic impedance of the signal line 35b can be effectively reduced. Further, as described in the first embodiment, two GND lines 35a are provided on both sides of the signal line 35b so as to extend along the signal line 35b and reach the dielectric layer 60. Such a structure may be provided continuously.
More specifically, matching between the characteristic impedance of the signal line 35b and the impedance of the circuit element included in the semiconductor chip 15 is mainly based on the width of the GND line 35a (indicated by A in FIGS. 8C and 8D). , The width of the signal line 35b (indicated by B in FIG. 8C), and the thickness of the GND line 35a (d in FIG. 8C).1Indicated by ), The thickness of the signal line 35b (d in FIG.TwoIndicated by ), The vertical spacing between the GND line 35a and the signal line 35b (indicated by C 'in FIGS. 8C and 8D),Line 35 (distributionLine 35a, 35b) and the dielectric constant ε of the dielectric layer around the conductive portion (electrode pad 20, post part 40) on the semiconductor chip 15 (here, the signal line 35b). Greatly affects the characteristic impedance of the polyimide film 60 between the signal line 35b and the GND line 35a) and the thickness of the surrounding dielectric layer (here, the polyimide film 60) (see FIG. ) To dFourIndicated by ) Can be adjusted and taken. In addition,Line 3When the forming material of No. 5 is a magnetic material, it is desirable to also consider the magnetic permeability.
Therefore, for example, when it is desired to set the characteristic impedance of the signal line 35b to about 50 [Ω] which is almost the same as the impedance of the circuit element included in the semiconductor chip 15, for example, A = 400 μm, B = 40 μm, d1= 5 [μm], d2= 5 [μm], C ′ = 33 μm, ρ = 1.67 × 10-6[Ωcm (20 ° C.)], ε ≒ 3.3 [F / m] and d4= 38 [μm].
As is clear from the above description, in this embodiment, the matching between the characteristic impedance of the signal line 35b and the impedance of the circuit element included in the semiconductor chip 15 is realized. Therefore, transmission of a high-frequency signal can be efficiently realized, and a semiconductor device having higher-frequency characteristics than a conventional device can be obtained.
With reference to FIG. 9, a semiconductor device according to an eighth embodiment of the present invention will be described.
In this embodiment, a dielectric layer 65 having a higher dielectric constant than the dielectric layer 60 is used as the second insulating layer instead of the dielectric layer 60 in the seventh embodiment. This is the main difference from the seventh embodiment.
In this embodiment, a phenol resin (dielectric constant ε ≒) is used as the dielectric layer 65 instead of the dielectric layer 60 (polyimide film (dielectric constant ε ≒ 3.3 [F / m])) in the seventh embodiment. 4.5 to 5 [F / m]).
Therefore, for example, when it is desired to set the characteristic impedance of the signal line 35b to about 50 [Ω] which is almost the same as the impedance of the circuit element included in the semiconductor chip 15, for example, A = 400 μm, B = 40 μm, d1= 5 [μm], d2= 5 [μm], C ′ = 35 μm, ρ = 1.67 × 10-6[Ωcm (20 ° C.)], ε ≒ 4.5-5 [F / m] and d4= 38 [μm].
With the above-described setting conditions, the same effects as in the seventh embodiment can be obtained.
Further, in this embodiment, a dielectric layer having a higher dielectric constant than that of the seventh embodiment, that is, a second insulating layer 65 is interposed between the signal line 35b and the GND line 35a.
As a result, the vertical interval (C 'in the figure) between the signal line 35b and the GND line 35a can be further increased as compared with the seventh embodiment.
Therefore, redistributionBy lineUndesired interaction between a certain GND line 35a and an integrated circuit provided in the semiconductor chip 15 is suppressed, and a more reliable semiconductor device can be obtained.
As described above, the present invention is not limited to only the combinations of the above-described embodiments. Therefore, the present invention can be applied by combining suitable conditions at any suitable stage.
Further, in each of the above-described embodiments, by providing the signal line 35b such that the signal line length of the signal line 35b is equal to or less than ４ of the effective wavelength of the operating frequency of the semiconductor chip, the transmission signal is reduced. Can be more effectively suppressed from being attenuated due to reflection or the like.
As is clear from the above description, according to the semiconductor device of the present invention, the characteristic impedance of the signal line and the impedance of the circuit element can be more matched than before.
FIG. 1 is a schematic plan view showing a semiconductor device according to a first embodiment of the present invention.
FIGS. 2A to 2C are a schematic plan view and a schematic sectional view showing a part of the semiconductor device according to the first embodiment of the present invention;
FIGS. 3A to 3C are a schematic plan view and a schematic sectional view showing a part of a semiconductor device according to a second embodiment of the present invention;
FIGS. 4A to 4C are a schematic plan view and a schematic sectional view showing a part of a semiconductor device according to a third embodiment of the present invention.
FIGS. 5A to 5C are a schematic plan view and a schematic sectional view showing a part of a semiconductor device according to a fourth embodiment of the present invention.
FIGS. 6A to 6C are a schematic plan view and a schematic sectional view showing a part of a semiconductor device according to a fifth embodiment of the present invention.
FIGS. 7A to 7C are a schematic plan view and a schematic cross-sectional view showing a part of a semiconductor device according to a sixth embodiment of the present invention.
FIGS. 8A to 8D are a schematic plan view and a schematic sectional view showing a part of a semiconductor device according to a seventh embodiment of the present invention.
FIGS. 9A to 9D are a schematic plan view and a schematic sectional view showing a part of a semiconductor device according to an eighth embodiment of the present invention.
10 WCSP
15… Semiconductor chip
20… Electrode pad
20a: First electrode pad
20b ... second electrode pad
25… passivation film
30 ... protective film
32 ... first insulating layer
35 ... distributionline
35a ... GND line (1st distributionline)
35b ... signal line (second line)line)
40… post part
40a: 1st post part
40b ... 2nd post part
45… Solder ball (external terminal)
50 ... sealing film
55 ... dielectric layer
60, 65 ... dielectric layer (second insulating layer)
351,352 ... contact part
In a semiconductor device packaged with the same outer dimensions as the outer dimensions of a semiconductor chip having circuit elements,
A plurality of electrode pads provided on the semiconductor chip,
An insulating layer provided on the semiconductor chip so as to expose a part of the surface of the electrode pad,
Above the insulating layer, a plurality of external terminals provided at positions different from immediately above the electrode pad,
And each of each said external terminal of said electrode pads, said provided on an insulating layer to electrically connect the second wiring to be the first wiring and the signal line to the ground line and a plurality of wiring including,
The second wiring is sandwiched between two of said first wiring is provided,
The two first wiring, the end on the side to be connected to the external terminals are coupled together, the second wiring, surrounds the side to be connected to the external terminal, to form a bond wiring A semiconductor device.
The semiconductor device according to claim 1, a semiconductor device, characterized in that said first wiring are a reticulated wiring.
In a semiconductor device packaged according to the external dimensions of a semiconductor chip having circuit elements,
Wherein the first distribution line, and wherein a extending toward the center of the second wiring by remote long the semiconductor chip.
JP2002233762A 2002-08-09 2002-08-09 Semiconductor device Active JP3580803B2 (en)
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