Electronic apparatus

An electronic apparatus includes a multilayered structure in which a plurality of semiconductor chips provided with semiconductor devices are stacked, penetrating electrodes penetrating the semiconductor chips and electrically connecting the semiconductor devices of the plurality of semiconductor chips, an MEMS chip mounted on the multilayered structure and provided with an MEMS device, wherein pads connecting to the penetrating electrodes are provided on the MEMS chip.

BACKGROUND

1. Technical Field

The present invention relates to an electronic apparatus.

2. Related Art

MEMS (Micro Electro Mechanical Systems) is one of micro structure formation technologies and refers to a technology of forming micro electromechanical systems on the order of micrometers and resulting products.

Recently, in the field of timing devices represented by quartz oscillators and ceramic oscillators, attraction has been focused on timing devices using MEMS devices. Further, in the fields of automobiles, controllers and the like, attraction has been focused on acceleration sensors and gyro sensors using MEMS devices as means for detecting location information. In an electronic apparatus using the MEMS devices, functions of high value have been realized by combining the MEMS devices and memories and logic circuits.

For example, Patent Document 1 (WO 2007/147137) discloses an electronic apparatus in which an MEMS chip with an MEMS device formed thereon and a control chip with an integrated circuit formed thereon are electrically connected via wire bonding.

However, in the electronic apparatus of Patent Document 1, the MEMS chip and the control chip are electrically connected via wire bonding, and downsizing of the apparatus has been difficult. For example, in the electronic apparatus of Patent Document 1, the control chip should be larger than the MEMS chip for forming an area for connection of bonding wires on the control chip and downsizing of the apparatus has been difficult.

SUMMARY

An advantage of some aspects of the invention is to provide an electronic apparatus that may be downsized.

An electronic apparatus according to an aspect of the invention includes a multilayered structure in which a plurality of semiconductor chips provided with semiconductor devices are stacked, a penetrating electrode penetrating the semiconductor chips and electrically connecting the semiconductor devices of the plurality of semiconductor chips, an MEMS chip mounted on the multilayered structure and provided with an MEMS device, wherein a pad connecting to the penetrating electrode is provided on the MEMS chip.

According to the electronic apparatus, the semiconductor chips are connected by the penetrating electrode and the MEMS chip is connected to the penetrating electrode by the pad, and thus, downsizing may be realized compared to the case where the semiconductor chips and the MEMS chip and the semiconductor chip are connected using wire bonding, for example. Further, the penetrating electrode is not necessarily formed in the MEMS chip, and thereby, the degree of freedom of choice of a substrate forming the MEMS chip is higher.

The electronic apparatus according to the aspect of the invention may be configured such that a recess part is provided on a surface of the multilayered structure facing the MEMS chip.

According to the electronic apparatus of this configuration, stress applied to the MEMS chip may be relaxed.

The electronic apparatus according to the aspect of the invention may be configured such that the semiconductor device of the semiconductor chip facing the MEMS chip is provided on a surface at the MEMS chip side.

According to the electronic apparatus of this configuration, an amount of radiation applied to the semiconductor device may be reduced by the MEMS chip.

The electronic apparatus according to the aspect of the invention may be configured such that the electronic apparatus further includes a thermal conduction part penetrating the semiconductor chip and having higher heat conductivity than that of the semiconductor chips, and the thermal conduction part is electrically separated from the semiconductor devices.

According to the electronic apparatus of this configuration, rise of the temperature of the apparatus may be suppressed.

The electronic apparatus according to the aspect of the invention may be configured such that the penetrating electrode is formed in center parts of the semiconductor chips as seen from a stacking direction of the semiconductor chips.

According to the electronic apparatus of this configuration, delay times of signals used in the semiconductor chips may be made shorter.

The electronic apparatus according to the aspect of the invention may be configured such that a capacitor for supplying a power supply voltage to the semiconductor device is provided on the MEMS chip.

According to the electronic apparatus of this configuration, stabilization of power supply may be realized.

The electronic apparatus according to the aspect of the invention may be configured to include a heat dissipation part formed on a surface of the MEMS chip opposite to the multilayered structure.

According to the electronic apparatus of this configuration, the rise of the temperature of the apparatus may be suppressed.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

As below, preferred embodiments of the invention will be explained in detail using the drawings. Note that the embodiments to be explained do not unduly limit the invention described in the appended claims. Further, all of the configurations to be explained are not necessarily the essential component elements of the invention.

1. First Embodiment

1.1. Electronic Apparatus

First, an electronic apparatus according to the first embodiment will be explained with reference to the drawings.FIG. 1is a sectional view schematically showing an electronic apparatus100according to the embodiment.FIG. 2is a plan view schematically showing the electronic apparatus100according to the embodiment. Note thatFIG. 1is the sectional view taken along I-I line inFIG. 2. Further, inFIGS. 1 and 2, for convenience, semiconductor chips10,20,30and an MEMS chip40are simplified.

As shown inFIG. 1, the electronic apparatus100includes a multilayered structure2in which the semiconductor chips10,20,30are stacked, penetrating electrodes4,6,8, and the MEMS chip40.

The multilayered structure2is formed by stacking of the semiconductor chips10,20,30. In the illustrated example, the multilayered structure2is formed by the first semiconductor chip10, the second semiconductor chip20on the first semiconductor chip10, and the third semiconductor chip30on the second semiconductor chip20. Note that the number of semiconductor chips forming the multilayered structure2is not particularly limited, but maybe two or more. Insulating layers (not shown) may be formed between the adjacent semiconductor chips10,20,30. That is, the second semiconductor chip20may be stacked on the first semiconductor chip10via the insulating layer, and the third semiconductor chip30may be stacked on the second semiconductor chip20via the insulating layer.

On the semiconductor chips10,20,30, semiconductor devices are provided. The semiconductor chips10,20,30each includes a substrate, the semiconductor device formed on the substrate, and wires connected to the semiconductor device, for example. In the illustrated example, the first semiconductor chip10has a device formation region14in which the semiconductor device is formed. The second semiconductor chip20has a device formation region24in which the semiconductor device is formed. The third semiconductor chip30has a device formation region34in which the semiconductor device is formed. The semiconductor chips10,20,30may be logic chips having logic circuits formed in the device formation regions14,24,34, for example. Alternatively, the semiconductor chips10,20,30may be memory chips having nonvolatile memories formed in the device formation regions14,24,34, for example. In the illustrated example, the device formation regions14,24,34are formed on the upper surfaces (the surfaces at the MEMS chip40side) of the respective semiconductor chips10,20,30. Note that, through not illustrated, the device formation regions14,24,34may be formed on the lower surfaces (the opposite surfaces to the MEMS chip40) of the respective semiconductor chips10,20,30. The first semiconductor chip10, the second semiconductor chip20, and the third semiconductor chip30have the same shape and the same size as seen from the stacking direction of the semiconductor chips10,20,30, for example. The planar shape (the shape as seen from the stacking direction of the semiconductor chips10,20,30) of the semiconductor chips10,20,30is rectangular, for example.

The penetrating electrode4penetrates the first semiconductor chip10. The penetrating electrode4extends from the upper surface to the lower surface of the first semiconductor chip10in the stacking direction of the semiconductor chips10,20,30. The penetrating electrode4is electrically connected to the semiconductor device formed in the device formation region14. Further, the penetrating electrode4is connected to the penetrating electrode6. In the illustrated example, four penetrating electrodes4are formed on the first semiconductor chip10, but the number is not particularly limited.

The penetrating electrode6penetrates the second semiconductor chip20. The penetrating electrode6extends from the upper surface to the lower surface of the second semiconductor chip20in the stacking direction of the semiconductor chips10,20,30. The penetrating electrode6is electrically connected to the semiconductor device formed in the device formation region24. Further, the penetrating electrode6is connected to the penetrating electrode4and the penetrating electrode8. Four penetrating electrodes6are formed on the second semiconductor chip20, but the number is not particularly limited.

The penetrating electrode8penetrates the third semiconductor chip30. The penetrating electrode8extends from the upper surface to the lower surface of the third semiconductor chip30in the stacking direction of the semiconductor chips10,20,30. The penetrating electrode8is electrically connected to the semiconductor device formed in the device formation region34. Further, the penetrating electrode8is connected to the penetrating electrode6and pads42. Four penetrating electrodes8are formed on the third semiconductor chip30, but the number is not particularly limited.

The penetrating electrodes4,6,8are Si through-silicon vias (TSV). The penetrating electrode4, the penetrating electrode6, and the penetrating electrode8are connected and integrated and penetrate the multilayered structure2. The penetrating electrodes4,6,8electrically connect the semiconductor devices of the semiconductor chips10,20,30. Further, the penetrating electrodes4,6,8electrically connect the respective semiconductor devices of the semiconductor chips10,20,30and an MEMS device formed on the MEMS chip40. The material of the penetrating electrodes4,6,8is W, Cu, AL, Ag, Au, or the like, for example. Furthermore, the penetrating electrodes4,6,8may have barrier layers of TiN, Ti, or the like.

For example, the penetrating electrode4is formed by forming a through hole from the opposite surface (rear surface) side to the surface (front surface) on which the device formation region14of the first semiconductor chip10is formed, and burying the through hole with the above described metal material. The penetrating electrodes6,8are formed in the same manner. For example, the multilayered structure2is formed by stacking the second semiconductor chip20on the first semiconductor chip10so that the penetrating electrodes4,6may be connected and the third semiconductor chip30on the second semiconductor chip20so that the penetrating electrodes6,8may be connected. The penetrating electrodes4,6,8are connected using micro bump or the like, for example.

The MEMS chip40is mounted on the multilayered structure2. In the illustrated example, the MEMS chip40is mounted on the third semiconductor chip30. In the electronic apparatus100, the first semiconductor chip10, the second semiconductor chip20, the third semiconductor chip30, and the MEMS chip40are stacked in this order. The MEMS chip40has a device formation region44in which the MEMS device is formed. The device formation region44is formed at the multilayered structure2side (on the lower surface in the illustrated example).

On the MEMS chip40, the pads42connecting to the penetrating electrodes8are provided. The pads42are in contact with the penetrating electrodes8in the illustrated example. The pads42are terminals for attaching the MEMS chip40to the third semiconductor chip30(multilayered structure2). The pads42are bonded to the penetrating electrodes8. The pads42may be bonded to the penetrating electrodes8via bonding members including solder, for example. The pads42are electrically connected to the MEMS device. Accordingly, the MEMS device of the MEMS chip40and the semiconductor devices of the semiconductor chips10,20,30are electrically connected via the pads42and the penetrating electrodes4,6,8. As described above, in the electronic apparatus100, the MEMS device of the MEMS chip40and the semiconductor devices of the semiconductor chips10,20,30are electrically connected via the pads42and the penetrating electrodes4,6,8, and thus, no penetrating electrode (TSV) is formed on the MEMS chip40. In the illustrated example, four pads42are provided on the MEMS chip40, however, the number is not limited. The pads42are provided to overlap with the penetrating electrodes8as seen from the stacking direction of the semiconductor chips10,20,30.

The device formation region34of the third semiconductor chip30facing the MEMS chip40is provided on the surface at the MEMS chip40side (the upper surface in the illustrated example). Further, the MEMS chip40is provided above the device formation region34of the third semiconductor chip30. Accordingly, the MEMS chip40may block radiation including α-ray traveling toward the device formation region34of the third semiconductor chip30. Therefore, the amount of radiation applied to the device formation region34of the third semiconductor chip30may be reduced. Thereby, occurrence of soft errors of the semiconductor device formed in the device formation region34may be reduced. For example, the thickness t of the MEMS chip40is larger than the penetration depth of the α-ray. Specifically, the thickness t of the MEMS chip40is 30 μm or more, for example. Thereby, the occurrence of soft errors of the semiconductor device may be reduced more effectively. Note that the radiation source of α-ray or the like is a resin (mold resin) used for packaging or the like.

As below, the configuration of the MEMS chip40will be explained more specifically.FIG. 3is a sectional view schematically showing a part of the MEMS chip40. For convenience,FIG. 3shows the view upside down compared toFIG. 1. Here, the case where an MEMS device420of the MEMS chip40is an MEMS vibrator will be explained.

For example, as shown inFIG. 3, the MEMS chip40includes a substrate410, the MEMS device420, interlayer insulating layers430,432,434, surrounding walls450,452,454, covering layers456,458, the pads42, interconnections460,462,464, a passivation layer470, and a protective film480.

As the substrate410, for example, a semiconductor substrate including a silicon substrate is used. As the substrate410, various substrates including a ceramics substrate, a glass substrate, a sapphire substrate, a diamond substrate, and a synthetic resin substrate may be used. No penetrating electrode is provided in the MEMS chip40, and thus, not limited to the silicon substrate, but the above described various substrates may be used as the substrate410. That is, the MEMS chip40has a high degree of freedom of choice of the substrate410.

On the substrate410, a foundation layer411is formed. The foundation layer411is a LOCOS (local oxidation of silicon) insulating layer, a semi-recess LOCOS insulating layer, or a trench insulating layer, for example.

The MEMS device420is formed on the foundation layer411(over the substrate410) and housed in a cavity part440. The MEMS device420is an MEMS vibrator in a cantilever shape, for example. In the illustrated example, the MEMS device420has a first electrode422formed on the foundation layer411and a second electrode424formed apart from the first electrode422.

The second electrode424may have a beam part provided to face the first electrode422. In the MEMS device420, when a voltage (alternating voltage) is applied between the first electrode422and the second electrode424, the beam part may vibrate in the thickness directions of the substrate410because of the electrostatic force generated between the electrodes422,424. In the electronic apparatus100, the integrated circuits (semiconductor devices) formed in the device formation regions14,24,34of the semiconductor chips10,20,30and the MEMS device420formed on the MEMS chip40form an oscillator circuit. The integrated circuits and the MEMS device420are electrically connected via the penetrating electrodes4,6,8and the pads42.

Note that the MEMS device420is not limited to the vibrator, but may be various MEMS devices including an acceleration sensor, a gyro sensor, and a micro actuator, for example.

The surrounding walls450,452,454and the covering layers456,458define (designate) the cavity part440in which the MEMS device420is housed. The interior of the cavity part440is under a decompression condition, for example. The three interlayer insulating layers430,432,434are provided in the order of the interlayer insulating layer430, the interlayer insulating layer432, and the interlayer insulating layer434from the substrate410side, however, the number is not particularly limited.

The first covering layer456is formed to cover the cavity part440from above. A through hole456ais provided in the first covering layer456. In the process of forming the cavity part440, an etching solution or an etching gas may be supplied through the through hole456a.

The second covering layer458is formed on the first covering layer456. The second covering layer458covers the through hole456aformed in the first covering layer456. Thereby, a gas or the like may be prevented from entering the cavity part440from outside through the through hole456a.

The interconnection460is formed on the interlayer insulating layer432. The interconnection460is electrically connected to the MEMS device420, for example. The interconnection460is electrically connected to the pad42via the interconnection462penetrating the interlayer insulating layer434and the interconnection464on the passivation layer470. That is, the pad42and the MEMS device420are electrically connected. The pad42is formed on the interconnection464. The pad42is connected to the penetrating electrode8penetrating the third semiconductor chip30. That is, the MEMS chip40is mounted face-down on the third semiconductor chip30(multilayered structure2).

The protective film480is provided on the passivation layer470, on the second covering layer458, and on the interconnection464. The protective film480protects the MEMS device420, the interconnection464, etc. The pad42is exposed from the protective film480.

The electronic apparatus100according to the embodiment has the following advantages, for example.

The electronic apparatus100includes the multilayered structure2in which the plurality of semiconductor chips10,20,30provided with the semiconductor devices are stacked, the penetrating electrodes4,6,8penetrating the semiconductor chips10,20,30and electrically connecting the semiconductor chips10,20,30, and the MEMS chip40mounted on the multilayered structure2and provided with the MEMS device420, and the pads42connecting to the penetrating electrodes8are provided on the MEMS chip40. In the electronic apparatus100, the semiconductor chips10,20,30are connected by the penetrating electrodes4,6,8, and thereby, downsizing may be realized compared to the case where the semiconductor chips10,20,30are connected via wire bonding, for example.

Further, in the electronic apparatus100, the pads42connected to the penetrating electrodes8are provided on the MEMS chip40. That is, the MEMS chip40is connected to the third semiconductor chip30by the pads42. Accordingly, in the MEMS chip40, no penetrating electrode (TSV) is formed.

Therefore, the MEMS chip40itself may be downsized and downsizing of the apparatus may be realized. Further, no penetrating electrode is formed in the MEMS chip40, and thereby, various other substrates than the silicon substrate may be used as the substrate410, and the degree of freedom of choice of the substrate410is higher.

According to the electronic apparatus100, no integrated circuit is formed on the MEMS chip40, but the integrated circuits are formed on the semiconductor chips10,20,30, and thus, the older process technology generation than the process technology generation of the semiconductor chips10,20,30may be used on the MEMS chip40. Thereby, the lower cost may be realized.

According to the electronic apparatus100, the semiconductor device of the third semiconductor chip30facing the MEMS chip40is provided on the surface at the MEMS chip40side, and thus, the amount of radiation including CC-ray applied to the semiconductor device (device formation region34) may be reduced by the MEMS chip40. Thereby, occurrence of soft errors of the semiconductor device due to radiation may be suppressed.

1.2. Modified Examples of Electronic Apparatus

Next, modified examples of the electronic apparatus according to the first embodiment will be explained. As below, in the electronic apparatus according to the modified examples of the embodiment, the members having the same functions as the component members of the above described electronic apparatus100have the same signs and their detailed explanation will be omitted.

(1) First Modified Example

First, a first modified example will be explained with reference to the drawing.FIG. 4is a sectional view schematically showing an electronic apparatus200according to the first modified example. Note that, inFIG. 4, for convenience, the semiconductor chips10,20,30and the MEMS chip40are simplified.

In the electronic apparatus200, as shown inFIG. 4, a recess part210is formed on the surface of the multilayered structure2facing the MEMS chip40. In the illustrated example, the recess part210is formed on the surface of the third semiconductor chip30facing the MEMS chip40(the upper surface in the illustrated example). The recess part210is formed by etching of the rear surface side (the opposite surface to the surface with the device formation region34thereon) of the third semiconductor chip30, for example.

In the electronic apparatus200, the device formation regions14,24,34are formed on the lower surfaces (the opposite surfaces to the MEMS chip40side) of the respective semiconductor chips10,20,30.

In the electronic apparatus200, the recess part210is formed on the surface of the multilayered structure2facing the MEMS chip40, and thus, stress applied to the MEMS chip40may be relaxed.

(2) Second Modified Example

Next, a second modified example will be explained with reference to the drawings.FIG. 5is a sectional view schematically showing an electronic apparatus300according to the second modified example.FIG. 6is a plan view schematically showing the electronic apparatus300according to the second modified example. Note thatFIG. 5is the sectional view taken along V-V line inFIG. 6. Further, inFIGS. 5 and 6, for convenience, the semiconductor chips10,20,30and the MEMS chip40are simplified.

As shown inFIGS. 5 and 6, the electronic apparatus300may further include thermal conduction parts310,320,330penetrating the semiconductor chips10,20,30and having higher thermal conductivity than that of the semiconductor chips10,20,30in addition to the component members of the electronic apparatus100.

The thermal conduction part310penetrates the first semiconductor chip10. The thermal conduction part310connects to the thermal conduction part320. The thermal conduction part310is electrically separated from the semiconductor device of the first semiconductor chip10. That is, the thermal conduction part310is not electrically connected to the semiconductor device or does not function as a penetrating electrode.

The thermal conduction part320penetrates the second semiconductor chip20. The thermal conduction part320connects to the thermal conduction part310and the thermal conduction part330. The thermal conduction part320is electrically separated from the semiconductor device of the second semiconductor chip20. That is, the thermal conduction part320is not electrically connected to the semiconductor device or does not function as a penetrating electrode.

The thermal conduction part330penetrates the third semiconductor chip30. The thermal conduction part330connects to the thermal conduction part320and a pad42a. Note that, though not illustrated, the thermal conduction part330may not necessarily be connected to the pad42a. The pad42ais provided on the MEMS chip40, but not electrically connected to the MEMS device420. The thermal conduction part330is electrically separated from the semiconductor device of the third semiconductor chip30. That is, the thermal conduction part330is not electrically connected to the semiconductor device or does not function as a penetrating electrode.

The thermal conduction parts310,320,330are formed in regions of the semiconductor chips10,20,30prone to heat generation or nearby. The thermal conduction parts310,320,330are provided in the center parts of the semiconductor chips10,20,30and the four corners of the semiconductor chips10,20,30, for example. Five of the thermal conduction parts310,320,330are respectively provided in the respective semiconductor chips10,20,30in the illustrated example, however, the number is not particularly limited. The thermal conduction part310, the thermal conduction part320, and the thermal conduction part330are connected and integrated and penetrate the multilayered structure2. The material of the thermal conduction parts310,320,330is the same as the material of the penetrating electrodes4,6,8, for example. The method of manufacturing the thermal conduction parts310,320,330is the same as the method of manufacturing the penetrating electrodes4,6,8, for example.

The electronic apparatus300includes the thermal conduction parts310penetrating the semiconductor chips10,20,30and having the higher thermal conductivity than that of the semiconductor chips10,20,30, and thus, heat dissipation may be improved. Thereby, the rise of the temperature of the apparatus may be suppressed. Further, in the case where the thermal conduction parts330are connected to the MEMS chip40, the difference in temperature between the MEMS chip40and the semiconductor chips10,20,30may be made smaller, and therefore, temperature control of the MEMS chip40may be easily performed by providing temperature sensor functions or the like to the semiconductor chips10,20,30, for example.

(3) Third Modified Example

Next, a third modified example will be explained with reference to the drawings.FIG. 7is a sectional view schematically showing an electronic apparatus400according to the third modified example.FIG. 8is a plan view schematically showing the electronic apparatus400according to the third modified example. Note thatFIG. 7is the sectional view taken along VII-VII line inFIG. 8. Further, inFIGS. 7 and 8, for convenience, the semiconductor chips10,20,30and the MEMS chip40are simplified.

In the electronic apparatus400, as shown inFIGS. 7 and 8, the penetrating electrodes4,6,8are provided in the center parts of the semiconductor chips10,20,30as seen from the stacking direction of the semiconductor chips10,20,30.

In the illustrated example, the semiconductor chips10,20,30have rectangular shapes as seen from the stacking direction of the semiconductor chips10,20,30. The penetrating electrodes4,6,8are provided at the centers (where diagonal lines intersect) of the semiconductor chips10,20,30as seen from the stacking direction of the semiconductor chips10,20,30.

According to the electronic apparatus400, the penetrating electrodes4,6,8are provided in the center parts of the semiconductor chips10,20,30as seen from the stacking direction of the semiconductor chips10,20,30, and thus, delay times of the signals used in the semiconductor chips10,20,30may be made shorter. For example, in the case where the penetrating electrodes4,6,8are provided in the corner parts of the semiconductor chips10,20,30as seen from the stacking direction of the semiconductor chips10,20,30, the distances to the opposite corner parts are longer and the delay times become longer.

Note that, for example, using a device which measures the delay times from the MEMS chip40to the first semiconductor chip10in the location farthest from the MEMS chip40, the clock signals from the MEMS chip40with an MEMS oscillator may be supplied to the respective semiconductor chips10,20,30at times when necessary.

(4) Fourth Modified Example

Next, a fourth modified example will be explained with reference to the drawing.FIG. 9is a sectional view schematically showing an electronic apparatus500according to the fourth modified example. Note that, inFIG. 9, for convenience, the semiconductor chips10,20,30and the MEMS chip40are simplified.

In the electronic apparatus500, as shown inFIG. 9, a power supply capacitor510for supplying a power supply voltage to the semiconductor devices of the semiconductor chips10,20,30is provided on the MEMS chip40.

In the illustrated example, the power supply capacitor510includes a first electrode510a, and a second electrode510bprovided to face the first electrode510a. The power supply capacitor510may supply the power supply voltage to the semiconductor chips10,20,30via the penetrating electrodes4,6,8. Further, for example, in the power supply capacitor510, a power supply of VDD and GND is supplied to the semiconductor chips10,20,30by the adjacent penetrating electrodes4,6,8, and thereby, fluctuations of the power supply voltage may be reduced by the coupling capacity between VDD and GND. The power supply capacitor510is provided to avoid the device formation region in which the MEMS device is provided.

According to the electronic apparatus500, the power supply capacitor510is provided on the MEMS chip40, and thus, stabilization of power supply may be realized.

(5) Fifth Modified Example

Next, a fifth modified example will be explained with reference to the drawing.FIG. 10is a sectional view schematically showing an electronic apparatus600according to the fifth modified example. InFIG. 10, for convenience, the semiconductor chips10,20,30and the MEMS chip40are simplified.

In the electronic apparatus600, as shown inFIG. 10, a heat dissipation part610is provided on the surface of the MEMS chip40opposite to the multilayered structure2.

The heat dissipation part610is provided on the surface opposite to the surface having the device formation region44in which the MEMS device is formed. The heat dissipation part610may suppress rise of the temperature of the electronic apparatus600. The heat dissipation part610dissipates heat by air cooling or liquid cooling, for example. The heat dissipation part610is a heat sink, a heat pipe, or the like, for example.

In the electronic apparatus600, the heat dissipation part610is provided, and thus, the rise of the temperature of the electronic apparatus600maybe suppressed.

2. Second Embodiment

Next, an electronic apparatus according to the second embodiment will be explained with reference to the drawing.FIG. 11is a sectional view schematically showing an electronic apparatus700according to the second embodiment.

As shown inFIG. 11, the electronic apparatus700further includes a package701in addition to the component members of the electronic apparatus100. The package701may house the semiconductor chips10,20,30and the MEMS chip40.

The package701may have a package base701, a lid720, and a lead frame730.

In the package base710, a recess part712is formed, and the multilayered structure2and the MEMS chip40are provided within the recess part712. The planar shape of the package base710is not particularly limited as long as the multilayered structure2and the MEMS chip40may be provided within the recess part712. As the package base710, for example, a material including an aluminum oxide sintered body formed by shaping, stacking, and sintering ceramic green sheets, quartz, glass, and silicon is used.

The lid720is provided to cover the recess part712of the package base710. As the lid720, for example, the same material as that of the package base710may be used. The lid720is bonded to the package base710via a bonding member including a seam ring, low-melting-point glass, an adhesive agent (not shown), for example.

The air-tightly sealed interior of the recess part712of the package base710may be under a decompressed vacuum condition (high vacuum condition), or a condition filled with an inert gas of nitride, helium, argon, or the like.

The lead frame730may connect the semiconductor chips10,20,30and the MEMS chip40housed in the package701and external wiring (not shown). In the illustrated example, the lead frame730is connected to rear surface electrodes732of the first semiconductor chip10via wires734made of aluminum or gold. The rear surface electrodes732are electrically connected to the penetrating electrodes4, for example. Further, the lead frame730may support and secure the package701.

FIG. 12is a sectional view schematically showing an electronic apparatus800according to a modified example of the second embodiment. Note that, inFIG. 12, for convenience, the semiconductor chips10,20,30and the MEMS chip40are simplified.

As shown inFIG. 12, the electronic apparatus800is a CSP including a WCSP (Wafer level Chip size package), for example. The semiconductor chips10,20,30and the MEMS chip40are covered by a resin810. In the electronic apparatus800, the semiconductor chips10,20,30and the MEMS chip40and external wiring (not shown) may be electrically connected via solder balls820. In the illustrated example, the solder balls820are connected to rear surface electrodes830of the first semiconductor chip10. The rear surface electrodes830are electrically connected to the penetrating electrodes4.

Next, as the third embodiment, the case where the electronic apparatus according to an aspect of the invention is an oscillator will be explained with reference to the drawing. As below, the case where the electronic apparatus100is an oscillator will be explained.FIG. 13is a circuit diagram showing the electronic apparatus (oscillator)100according to the third embodiment.

As shown inFIG. 13, the electronic apparatus100includes the MEMS device (MEMS vibrator)420and an inverting amplifier circuit110, for example. The inverting amplifier circuits110are provided on the semiconductor chips10,20,30shown inFIG. 1, for example.

The MEMS device420has a first terminal420aelectrically connected to the first electrode422(seeFIG. 3), and a second terminal420belectrically connected to the second electrode424(seeFIG. 3). The first terminal420aof the MEMS device420is at least alternately connected to an output terminal110bof the inverting amplifier circuit110. The second terminal420bof the MEMS device420is at least alternately connected to an input terminal110aof the inverting amplifier circuit110.

In the illustrated example, the inverting amplifier circuit110includes one inverter, however, may be formed by combining a plurality of inverters (inverting circuits) and amplifier circuits for satisfaction of a desired oscillation condition.

The electronic apparatus100may include a feedback resistor with respect to the inverting amplifier circuit110. In the example shown inFIG. 13, the input terminal and the output terminal of the inverting amplifier circuit110are connected via a resister120.

The electronic apparatus100includes a first capacitor130connected between the input terminal110aof the inverting amplifier circuit110and a reference potential (ground potential), and a second capacitor132connected between the output terminal110bof the inverting amplifier circuit110and a reference potential (ground potential). Thereby, an oscillator circuit in which a resonator circuit is formed by the MEMS device420and the capacitors130,132may be obtained. The electronic apparatus100outputs an oscillation signal f obtained by the oscillator circuit.

As shown inFIG. 14, the electronic apparatus100may further have a frequency divider circuit140. The frequency divider circuit140divides the frequency of the output signal Vout of the oscillator circuit and outputs the oscillation signal f. Thereby, the electronic apparatus100may obtain an output signal at the lower frequency than the frequency of the output signal Vout, for example.

Note that, here, the case where the electronic apparatus100is an oscillator including the MEMS device (MEMS vibrator)420is explained, however, the electronic apparatus100may be an acceleration sensor, a gyro sensor, a relay using an MEMS contact, or the like as long as it may be an apparatus including an MEMS device.

The above described embodiments and modified examples are just examples, and not limited to those. For example, the respective embodiments and the respective modified examples may be appropriately combined.

The invention includes substantially the same configurations (the same configurations in function, method, and result or the same configurations in purpose and advantage) as the configurations explained in the embodiments. Further, the invention includes configurations in which non-essential parts of the configurations explained in th embodiments are replaced. Furthermore, the invention includes configurations that may exert the same effects or achieve the same purposes as those of the configurations explained in the embodiments. In addition, the invention includes configurations formed by adding known technologies to the configurations explained in the embodiments.

The entire disclosure of Japanese Patent Application No. 2012-202374, filed Sep. 14, 2012 is expressly incorporated by reference herein.