US5142240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifier circuit with correction of amplitude and phase distortions
Assignee: Mitsubishi Electric Corp
•
Filing: 1990-12-21
•
Granted: 1992-08-25
•
Expires: 2010-12-21
Abstract
Abstract A high frequency amplifier circuit comprises an amplitude characteristic correction circuit and a phase characteristic correction circuit for compensating the non-linearity of the input-output characteristics of the amplifier. The amplitude characteristic correction circuit varies the drain voltage or the collector voltage of the amplifier in accordance with the envelope level of an input signal in such a manner that the relationship between the amplitude of the output of the amplifier and the amplitude of the input signal has linearity. On the other hand, the phase characteristic correction circuit provides a quantity of phase shift to the input signal in accordance with the envelope level of the input signal, and the phase-shifted input signal is applied to the amplifier in such a manner that the phase of the output of the amplifier and that of the input signal coincide with each other.
Inventors
- 👤 Yoji Isota
- 👤 Gen Toyoshima
- 👤 Noriharu Suematsu
- 👤 Yukio Ikeda
- 👤 Tadashi Takagi
- 👤 Shuji Urasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:08
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/02; H03F1/0205; H03F1/0211; H03F1/0216; H03F1/0222; H03F1/0227; H03F1/32; H03F1/3223
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
107 words
An amplifier circuit, comprising: an amplifier for amplifying an input signal and generating an output signal corresponding thereto, said amplifier exhibiting nonlinear amplitude and phase characteristics; detector means for detecting a parameter of said input signal and developing a detection signal corresponding thereto, said detection signal being independent of parameters of said output signal; amplitude characteristic correction means for varying a supply voltage of said amplifier in accordance with said detection signal so as to correct said nonlinear amplitude characteristic; and phase characteristic correction means for varying a phase of said input signal in accordance with said detection signal so as to correct said nonlinear phase characteristic.
Claim 2
Dependent Claim
107 words
An amplifier circuit, comprising: an amplifier for amplifying an input signal and generating an output signal corresponding thereto, said amplifier exhibiting nonlinear amplitude and phase characteristics; detector means for detecting a parameter of said input signal and developing a detection signal corresponding thereto, said detection signal being independent of parameters of said output signal; amplitude characteristic correction means for varying a supply voltage of said amplifier in accordance with said detection signal so as to correct said nonlinear amplitude characteristic; and phase characteristic correction means for varying a phase of said input signal in accordance with said detection signal so as to correct said nonlinear phase characteristic.
Claim 3
Dependent Claim
112 words
An amplifier circuit, comprising: an amplifier for amplifying an input signal and generating an output signal corresponding thereto, said amplifier exhibiting nonlinear amplitude and phase characteristics; detector means for detecting a parameter of said input signal and developing a detection signal corresponding thereto; amplitude characteristic correction means for varying a supply voltage of said amplifier in accordance with said detection signal so as to correct said nonlinear amplitude characteristic; and phase characteristic correction means for varying a phase of said input signal in accordance with said detection signal so as to correct said nonlinear phase characteristic, wherein said detector means comprises an envelope detector for detecting the envelope of said input signal.
Claim 4
Dependent Claim
112 words
An amplifier circuit, comprising: an amplifier for amplifying an input signal and generating an output signal corresponding thereto, said amplifier exhibiting nonlinear amplitude and phase characteristics; detector means for detecting a parameter of said input signal and developing a detection signal corresponding thereto; amplitude characteristic correction means for varying a supply voltage of said amplifier in accordance with said detection signal so as to correct said nonlinear amplitude characteristic; and phase characteristic correction means for varying a phase of said input signal in accordance with said detection signal so as to correct said nonlinear phase characteristic, wherein said detector means comprises an envelope detector for detecting the envelope of said input signal.
Claim 5
Dependent Claim
154 words
An amplifier circuit, comprising: an amplifier for amplifying an input signal and generating an output signal corresponding thereto, said amplifier exhibiting nonlinear amplitude and phase characteristics; detector means for detecting a parameter of said input signal and developing a detection signal corresponding thereto; amplitude characteristic correction means for varying a supply voltage of said amplifier in accordance with said detection signal so as to correct said nonlinear amplitude characteristic; and phase characteristic correction means for varying a phase of said input signal in accordance with said detection signal so as to correct said nonlinear phase characteristic; wherein said detector means comprises an envelope detector for detecting the envelope of said input signal; and said amplitude characteristic correction means comprises a nonlinearity control circuit for outputting a control voltage in accordance with said detection signal, and a variable supply voltage converter for applying a supply voltage to said amplifier in accordance with said control voltage.
Claim 6
Dependent Claim
154 words
An amplifier circuit, comprising: an amplifier for amplifying an input signal and generating an output signal corresponding thereto, said amplifier exhibiting nonlinear amplitude and phase characteristics; detector means for detecting a parameter of said input signal and developing a detection signal corresponding thereto; amplitude characteristic correction means for varying a supply voltage of said amplifier in accordance with said detection signal so as to correct said nonlinear amplitude characteristic; and phase characteristic correction means for varying a phase of said input signal in accordance with said detection signal so as to correct said nonlinear phase characteristic; wherein said detector means comprises an envelope detector for detecting the envelope of said input signal; and said amplitude characteristic correction means comprises a nonlinearity control circuit for outputting a control voltage in accordance with said detection signal, and a variable supply voltage converter for applying a supply voltage to said amplifier in accordance with said control voltage.
Claim 7
Dependent Claim
24 words
An amplifier circuit according to claim 3, wherein said amplifier comprises an FET, and said supply voltage is a drain voltage of said FET.
Claim 8
Dependent Claim
26 words
An amplifier circuit according to claim 3, wherein said amplifier comprises a bipolar transistor, and said supply voltage is a collector voltage of said bipolar transistor.
Claim 9
Dependent Claim
49 words
An amplifier circuit according to claim 3, wherein said phase characteristic correction means comprises a phase shifter control circuit for outputting phase shift information in accordance with said detection signal, and a phase shifter for shifting the phase of said input signal in accordance with said phase shift information.
Claim 10
Dependent Claim
36 words
An amplifier circuit according to claim 6, wherein the phase of said input signal is shifted by an amount such that the phase of said output signal coincides with the original phase of said input signal.
Claim 11
Dependent Claim
18 words
An amplifier circuit according to claim 6, wherein said phase shifter control circuit comprises a look-up table memory.
References Cited (Backward Citations)
US3755754A
Cited
US3900823A
Cited
US4068186A
Cited
US4122399A
Cited
US4465980A
Cited
US4532477A
Cited
US4600892A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-25 | 1996-02-24 | 1996-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-25 | 2000-02-24 | 2000-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-25 | 2004-02-24 | 2004-08-25 | $7700.00 | Window Closed / Lapsed |