Source: http://www.google.com/patents/US7667322?dq=5,963,646
Timestamp: 2016-05-03 05:13:51
Document Index: 642043439

Matched Legal Cases: ['Application No. 2006', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15', 'art 15']

Patent US7667322 - High-frequency semiconductor device - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsAn example of a high-frequency semiconductor device includes two unit semiconductor devices. Each of the two unit semiconductor devices has a ground substrate, a high-frequency semiconductor element, an input-side matching circuit, an output-side matching circuit, a side wall member, an input terminal,...http://www.google.com/patents/US7667322?utm_source=gb-gplus-sharePatent US7667322 - High-frequency semiconductor deviceAdvanced Patent SearchPublication numberUS7667322 B2Publication typeGrantApplication numberUS 11/779,904Publication dateFeb 23, 2010Priority dateApr 28, 2006Fee statusPaidAlso published asCN101361221A, EP2015392A1, EP2015392A4, US7994637, US20070290335, US20100102443, WO2007125633A1Publication number11779904, 779904, US 7667322 B2, US 7667322B2, US-B2-7667322, US7667322 B2, US7667322B2InventorsKazutaka TakagiOriginal AssigneeKabushiki Kaisha ToshibaExport CitationBiBTeX, EndNote, RefManPatent Citations (15), Non-Patent Citations (2), Referenced by (2), Classifications (25), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetHigh-frequency semiconductor device
US 7667322 B2Abstract
1. A high-frequency semiconductor device, comprising:
two unit semiconductor devices, each of which includes,
a ground substrate having a heat-radiating property;
a high-frequency semiconductor element on the ground substrate;
an input-side matching circuit connected to the high-frequency semiconductor element;
an output-side matching circuit connected to the high-frequency semiconductor element;
a side wall member surrounding at least the high-frequency semiconductor element;
an input terminal connected to the input-side matching circuit; and
an output terminal connected to the output-side matching circuit,
a grounding conductor in which one end of the two unit semiconductor devices is embedded; and
a plurality of auxiliary grounding conductors, each of the auxiliary grounding conductors contacting a different one of the ground substrates and extending from the grounding conductor to other ends of the two unit semiconductor devices, wherein,
the two unit semiconductor devices are coupled to each other at an upper edge of one of the side wall members, and
one of the two unit semiconductor devices is positioned upside down relative to an other of the two unit semiconductor devices.
2. The high-frequency semiconductor device according to claim 1, further comprising:
an input-side external circuit which is provided at an input side of the two unit semiconductor devices and is connected to each of the input terminals; and
an output-side external circuit which is provided at an output side of the two unit semiconductor devices and is connected to each of the output terminals, wherein
the grounding conductor has a heat-radiating property, and
the plurality of auxiliary grounding conductors has a heat-radiating property and is configured to clamp the other ends of the two unit semiconductor devices.
3. The high-frequency semiconductor device according to claim 2, wherein one of the input terminals has at least one part twisted and connected to the input-side external circuit.
4. The high-frequency semiconductor device according to claim 2, wherein one of the output terminals has at least one part twisted and connected to the output-side external circuit.
5. A high-frequency semiconductor device, comprising:
a side wall member surrounding at least the high-frequency semiconductor element and having one end projecting from the ground substrate;
an input terminal connected to the input-side matching circuit;
and an output terminal connected to the output-side matching circuit,
a conductive plate held between the one ends of the side wall members, and covering the high-frequency semiconductor element, the input-side matching circuit, and the output-side matching circuit of one of the two unit semiconductor devices,
grounding conductor in which one end of the two unit semiconductor devices is embedded; and
the one of the two unit semiconductor devices is positioned upside down relative to an other of the two unit semiconductor devices.
6. The high-frequency semiconductor device according to claim 5, further comprising:
an input-side external circuit which is provided at an input side of the two unit semiconductor devices and is connected to each of the input terminal terminals; and
an output-side external circuit which is provided at an output side of the two unit semiconductor devices and is connected to each of the output terminal terminals, wherein
7. The high-frequency semiconductor device according to claim 6, wherein one of the input terminals has at least one part twisted and connected to the input-side external circuit.
8. The high-frequency semiconductor device according to claim 6, wherein one of the output terminals has at least one part twisted and connected to the output-side external circuit.
9. The high-frequency semiconductor device according to claim 1, wherein the plurality of auxiliary grounding conductors cover the high-frequency semiconductor elements.
10. The high-frequency semiconductor device according to claim 3, wherein the at least one part extends beyond one of the side wall members, relative to one of the high-frequency semiconductor elements.
11. The high-frequency semiconductor device according to claim 4, wherein the at least one part extends beyond one of the side wall members, relative to one of the high-frequency semiconductor elements.
12. The high-frequency semiconductor device according to claim 7, wherein the at least one part extends beyond one of the side wall members, relative to one of the high-frequency semiconductor elements.
13. The high-frequency semiconductor device according to claim 8, wherein the at least one part extends beyond one of the side wall members, relative to one of the high-frequency semiconductor elements.
This application is based upon and claims the benefit of priority from PCT Application No. JP2007-000047, which is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2006-125328, filed Apr. 28, 2006, the entire contents of which are incorporated herein by reference.
According to another aspect of the present invention, there is provided another example of a high-frequency semiconductor device that includes two unit semiconductor devices. Each unit semiconductor device includes a ground substrate, a high-frequency semiconductor element, an input-side matching circuit, an output-side matching circuit, a side wall member, an input terminal, and an output terminal. The ground substrate has heat-radiating property. The high-frequency semiconductor element is provided on the ground substrate. The input-side matching circuit is connected to the high-frequency semiconductor element. The output-side matching circuit is connected to the high-frequency semiconductor element. The side wall member surrounds at least the high-frequency semiconductor element. The input terminal is connected to the output-side matching circuit. The output terminal is connected to the input-side matching circuit. The two unit semiconductor devices are coupled to each other through a conductive plate at upper edges of the side wall members.
FIG. 2 shows the configuration of a unit semiconductor device 11 according to the first embodiment. The unit semiconductor device 11 comprises a ground substrate 12, a semiconductor element such as a microwave transistor 13, an input terminal 15 a, an input-side matching circuit 15 b, an output-side matching circuit 15 c, and an output terminal 15 d. The ground substrate 12, i.e., a heat-radiating ground substrate, is made of Cu or W and can radiate heat. The microwave transistor 13, input terminal 15 a, input-side matching circuit 15 b, output-side matching circuit 15 c and output terminal 15 d are provided on the heat-radiating ground substrate 12. The semiconductor element is for use at high frequencies. It is, for example, a microwave transistor 13. The input terminal 15 a and input-side matching circuit 15 b are arranged on one side of the microwave transistor 13. The output-side matching circuit 15 c and output terminal 15 d are arranged on the other side of the microwave transistor 13.
The input terminal 15 a and the input-side matching circuit 15 b are connected by a lead line, such as gold wire 17 a. The input-side matching circuit 15 b and the microwave transistor 13 are connected by a gold wire 17 b. The microwave transistor 13 and the output-side matching circuit 15 c are connected by a gold wire 17 c. The output-side matching circuit 15 c and the output terminal 15 d are connected by a gold wire 17 d. As shown in FIG. 2, the microwave transistor 13 and the matching circuits 15 b and 15 c are surrounded by a sidewall 18. Nonetheless, the input terminal 15 a and output terminal 15 d are exposed in part.
The upper limit of the frequency range which can be used is determined by the resonance frequency in the cavity. At any frequency higher than the upper limit, the isolation between the terminals is impaired and power is dissipated into the space. Resonance frequency f is expressed as follows:
f=(λc/2)�SQRT[(m/a)2+(n/b)2+(k/c)2]
Resonance frequency f varies with the distribution of the magnetic field generated in the cavity. What are problematical are seven modes, each having a low resonance frequency. The resonance frequencies of these modes are given as follows:
f(TE100)=(λc/2)�(1/a) (1)
f(TE010)=(λc/2)�(1/b) (2)
f(TE001)=(λc/2)�(1/c) (3)
f(TE110)=(λc/2)�SQRT[(1/a)2+(1/b)2] (4)
f(TE101)=(λc/2)�SQRT[(1/a)2+(1/c)2] (5)
f(TE011)=(λc/2)�SQRT[(1/b)2+(1/c)2] (6)
f(TE111)=(λc/2)�SQRT[(1/a)2+(1/b)2+(1/c)2] (7)
Length a1 and length a2 are determined by the matching circuits. The length of the cavity of this embodiment is the same as that of the cavity of the conventional device. That is, a1=a2. The width of the cavity is constant, not depending on the number of semiconductor chips provided in the cavity. In the conventional semiconductor device, two chips are arranged side by side. In the present embodiment, one chip is divided into two segments in the widthwise direction, and the cavity is therefore half (�) as wide as the cavity of the conventional device. That is, b2=b�.
The cavity of the embodiment is twice as high as that of the conventional device, because the unit semiconductor devices 11 and 21 are laid one on the other. That is, c2=2�c1.
The devices 11 and 21 have been positioned upright. Then one end of the devices 11 and 21 is embedded in a grounding conductor 33 capable of radiating heat, as is illustrated in FIG. 7. Thereafter, auxiliary grounding conductors 31 and 32, both able to radiate heat, are secured to the other end of the devices 11 and 21, which are not embedded in the grounding conductor 33. These conductors 31 and 32 are arranged as if clamping those remaining parts of the devices 11 and 21. An input-side external circuit 34 is provided on the input side of the grounding conductor 33 capable of radiating heat and is connected to the projecting part 15 e of the input terminal 15 a. Similarly, an output-side external circuit 37 is provided on the output side of the grounding conductor 33 and is connected to the projecting part 15 f of the output terminal 15 d. FIG. 8 shows this semiconductor device for use at high frequencies, as is viewed from above. As seen from FIG. 8, signal lines can be easily grounded to provide a high-frequency semiconductor device that comprises two unit semiconductor devices.
A third embodiment will be described. FIG. 9 shows the structure of the third embodiment. In this embodiment, the projecting part 15 e of the input terminal 15 a and the projecting part 15 f of the output terminal 15 d, both shown in FIG. 5, are twisted and led outside.
As FIG. 9 shows, the projecting part 15 f of the output terminal is twisted and let outside. The grounding connection is the same as in the embodiment shown in FIG. 7. In the present embodiment, the projecting part 15 e of the input terminal and the input-side external circuit 34 contact in a surface, and the projecting part 15 f of the output terminal and the output-side external circuit 37 contact in a surface. Thus, the embodiment provides a high-frequency semiconductor device in which the signal lines can be easily connected and grounded.
It is good enough if the conductive plate 41 is made of metal. It is desired that the plate 41 should have an expansion coefficient similar to that of the heat-radiating ground substrate 12. Preferably, it should be made of the same material as the heat-radiating ground substrate 12. It is sufficient for the conductive plate 41 to be as large as would cover at least the sidewall 18. It is desired that the plate 41 be thick enough not to allow the passage of microwaves having a wavelength of 5 μm or more. It may be about 1 mm thick, in consideration of the handling readiness required.
Thereafter, auxiliary grounding conductors 31 and 32, both able to radiate heat, are secured to the other end of the devices 11 and 21, which are not embedded in the grounding conductor 33. These conductors 31 and 32 are arranged as if clamping those remaining parts of the devices 11 and 21. An input-side external circuit 34 is provided on the input side of the grounding conductor 33 capable of radiating heat and is connected to the projecting part 15 e of the input terminal. Similarly, an output-side external circuit 37 is provided on the output side of the grounding conductor 33 and is connected to the projecting part 15 f of the output terminal.
Still another embodiment will be described, with reference to FIG. 14. In this embodiment, the projecting part 15 e of the input terminal and the projecting part 15 f of the output terminal, both shown in FIG. 14, are twisted and led outside. FIG. 16 shows the structure of the sixth embodiment. As FIG. 16 shows, the projecting part 15 f of the output terminal is twisted and let outside. This embodiment is identical to the fifth embodiment shown in FIG. 14 in any other structural respects, such as grounding connection.
In the present embodiment, the projecting part 15 e of the input terminal and the input-side external circuit 34 contact in a surface, and the projecting part 15 f of the output terminal and the output-side external circuit 37 contact in a surface. Thus, the embodiment provides a high-frequency semiconductor device in which the signal lines can be easily connected and grounded.
2c < (a or b)
a = 1.0 cm, b = 1.0 cm, c = 0.4 cm (Unit: GHz)
2c > (a or b)
a = 1.0 cm, b = 1.0 cm, c = 0.6 cm (Unit: GHz)
In mode TE100, the device according to Patent Document 1 and the devices according to the first and fourth embodiments are just the same as the conventional device in terms of resonance frequency. In mode TE010, mode TE110 and mode TE011, any configuration can raise the resonance frequency over the conventional devices.
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