Patent US6462622B1 successfully refreshed from Google Patents.
US6462622B1
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US
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High-frequency amplifier and high-frequency multistage amplifier
Assignee: Mitsubishi Electric Corp
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Filing: 2001-11-19
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Granted: 2002-10-08
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Expires: 2021-11-19
Abstract
Abstract A T-type circuit having series resistors and a parallel resistor is arranged on the outside of an amplifier, a signal is amplified in the amplifier while stabilizing the signal by using the T-type circuit functioning as a stabilizing circuit, and the amplified signal is output. In this case, values of the series resistors and the parallel resistor of the T-type circuit are determined so as to set an output load impedance obtained by seeing the output side of the high-frequency amplifier from the amplifier to a value near to or slightly lower than a value of the conjugate complex impedance of an output impedance of the amplifier. Therefore, the output signal having a high output electric power and a low distortion can be obtained in the high-frequency amplifier while keeping a gain and a noise characteristic of the high-frequency amplifier.
Inventors
- 👤 Kazutomi Mori
- 👤 Kazuhisa Yamauchi
- 👤 Koji Yamanaka
- 👤 Kazuhiko Nakahara
- 👤 Tadashi Takagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:36
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/32; H03F1/3205; H03F3/00; H03F3/189; H03F3/19; H03F3/193; H03F3/1935; H03F2200/00; H03F2200/294; H03F2200/372
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
58 words
A low noise high-frequency amplifier comprising: an amplifier for amplifying an input signal; and a stabilizing circuit, which is arranged only on an output side of the amplifier directly connected thereto and has a series resistor and a parallel resistor, for stabilizing the amplification of the input signal performed in the amplifier and outputting the amplified input signal.
Claim 2
Dependent Claim
58 words
A low noise high-frequency amplifier comprising: an amplifier for amplifying an input signal; and a stabilizing circuit, which is arranged only on an output side of the amplifier directly connected thereto and has a series resistor and a parallel resistor, for stabilizing the amplification of the input signal performed in the amplifier and outputting the amplified input signal.
Claim 3
Dependent Claim
74 words
The low noise high-frequency amplifier according to claim 1 wherein the stabilizing circuit is formed of a T-type circuit having a first series resistor, a second series resistor and the parallel resistor and having an impedance which is set in a value such that an output load impedance of the amplifier is a value near to or slightly lower than a value of the conjugate complex impedance of the output impedance of the amplifier.
Claim 4
Dependent Claim
32 words
The low noise high-frequency amplifier according to claim 1 wherein the stabilizing circuit is formed of a n-type circuit having the series resistor, a first parallel resistor and a second parallel resistor.
Claim 5
Dependent Claim
27 words
The low noise high-frequency amplifier according to claim 1 wherein the stabilizing circuit is formed of a ladder-type circuit having the series resistor and the parallel resistor.
Claim 6
Dependent Claim
44 words
The low noise high-frequency amplifier according to claim 1 , further comprising: a series inductor arranged between the amplifier and the stabilizing circuit; and a parallel condenser arranged between the amplifier and the stabilizing circuit, both of which are directly coupled to the amplifier.
Claim 7
Dependent Claim
107 words
A low noise high-frequency multistage amplifier, comprising: a specific high-frequency amplifier, arranged in a first stage, for amplifying an input signal: and a general high-frequency amplifier, arranged in a stage following the first stage, for amplifying the input signal amplified by the specific high-frequency amplifier and outputting the amplified input signal as an output signal, and the specific high-frequency amplifier comprises an amplifier for amplifying the input signal; and a stabilizing circuit, which is arranged only on an output side of the amplifier directly connected thereto and has a series resistor and a parallel resistor, for stabilizing the amplification of the input signal performed in the amplifier.
Claim 8
Dependent Claim
107 words
A low noise high-frequency multistage amplifier, comprising: a specific high-frequency amplifier, arranged in a first stage, for amplifying an input signal: and a general high-frequency amplifier, arranged in a stage following the first stage, for amplifying the input signal amplified by the specific high-frequency amplifier and outputting the amplified input signal as an output signal, and the specific high-frequency amplifier comprises an amplifier for amplifying the input signal; and a stabilizing circuit, which is arranged only on an output side of the amplifier directly connected thereto and has a series resistor and a parallel resistor, for stabilizing the amplification of the input signal performed in the amplifier.
Claim 9
Dependent Claim
79 words
The low noise high-frequency multistage amplifier according to claim 6 wherein the stabilizing circuit of the specific high-frequency amplifier is formed of a T-type circuit having a first series resistor, a second series resistor and the parallel resistor having an impedance which is set in a value such that an output load impedance of the amplifier is a value near to or slightly lower than a value of the conjugate complex impedance of the output impedance of the amplifier.
Claim 10
Dependent Claim
38 words
The low noise low-frequency multistage amplifier according to claim 6 wherein the stabilizing circuit of the specific high-frequency amplifier is formed of a n-type circuit having the series resistor, a first parallel resistor and a second parallel resistor.
Claim 11
Dependent Claim
33 words
The low noise high-frequency multistage amplifier according to claim 6 wherein the stabilizing circuit of the specific high-frequency amplifier is formed of a ladder-type circuit having the series resistor and the parallel resistor.
References Cited (Backward Citations)
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| 3.5 Years (Year 4) | 2005-10-07 | 2006-04-08 | 2006-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-10-07 | 2010-04-08 | 2010-10-08 | $3760.00 | Window Closed / Lapsed |
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