Patent US4577165A successfully refreshed from Google Patents.
US4577165A
Expired / Lapsed
US
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High-frequency oscillator with power amplifier and automatic power control
Assignee: TOKYO DENSHI KAGAKU Co Ltd CORP OF JAPAN
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Filing: 1984-02-16
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Granted: 1986-03-18
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Expires: 2004-02-16
Abstract
Abstract A high-frequency oscillator including an oscillation circuit (1) having a quartz crystal (X) and an amplifying element (Q 2 ), a power amplifying circuit (3) for amplifying the output of the oscillation circuit, and a control system (Q 7 , 6) for varying a bias voltage of the amplifying element to thereby control the output power of the power amplification circuit. The control system comprises an FET (Q 7 ) connected at the drain thereof to the amplifying element, and a control circuit (6) for applying a control signal to the gate of the FET.
Inventors
- 👤 Akira Uehara
- 👤 Takashi Uehara
- 👤 Miyuki Saito
- 👤 Toshiyuki Ishida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:55
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/30; H03B5/32; H03B5/36; H03L; H03L5/00; H03L5/02; H03B2200/00; H03B2200/006; H03B2200/0094; H03B2200/0098
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
213 words
A high-frequency oscillator, comprising: an oscillation circuit (1) having a high-frequency oscillatory element (X) and an amplifying element (Q 2 ) for amplifying the output of said oscillatory element; a power amplification circuit (3) for amplifying the power of a high-frequency output of said oscillation circuit; control means (Q 7 , 6) for varying a bias voltage of said amplifying element to thereby control the output power of said power amplification circuit; said control means having a field effect transistor (Q 7 ) connected at the drain thereof to said amplifying element and a control circuit (6) for applying a direct-current control signal (S 3 ) to the gate of said field effect transistor; said control means further has a power detector (5) for detecting said output power of said power amplification circuit to give a converted direct-current signal (S 1 ) according thereto, and a reference signal source (7) for giving a predetermined reference signal (S 2 ) while it is continuously energized; said control circuit comprises an amplifier (6) for amplifying the difference between said converted signal and said reference signal to produce said control signal; and said reference signal source is adapted to cause, in the initial stage of energization thereof, said reference signal to rise with a predetermined time-constant.
Claim 2
Dependent Claim
213 words
A high-frequency oscillator, comprising: an oscillation circuit (1) having a high-frequency oscillatory element (X) and an amplifying element (Q 2 ) for amplifying the output of said oscillatory element; a power amplification circuit (3) for amplifying the power of a high-frequency output of said oscillation circuit; control means (Q 7 , 6) for varying a bias voltage of said amplifying element to thereby control the output power of said power amplification circuit; said control means having a field effect transistor (Q 7 ) connected at the drain thereof to said amplifying element and a control circuit (6) for applying a direct-current control signal (S 3 ) to the gate of said field effect transistor; said control means further has a power detector (5) for detecting said output power of said power amplification circuit to give a converted direct-current signal (S 1 ) according thereto, and a reference signal source (7) for giving a predetermined reference signal (S 2 ) while it is continuously energized; said control circuit comprises an amplifier (6) for amplifying the difference between said converted signal and said reference signal to produce said control signal; and said reference signal source is adapted to cause, in the initial stage of energization thereof, said reference signal to rise with a predetermined time-constant.
Claim 3
Dependent Claim
213 words
A high-frequency oscillator, comprising: an oscillation circuit (1) having a high-frequency oscillatory element (X) and an amplifying element (Q 2 ) for amplifying the output of said oscillatory element; a power amplification circuit (3) for amplifying the power of a high-frequency output of said oscillation circuit; control means (Q 7 , 6) for varying a bias voltage of said amplifying element to thereby control the output power of said power amplification circuit; said control means having a field effect transistor (Q 7 ) connected at the drain thereof to said amplifying element and a control circuit (6) for applying a direct-current control signal (S 3 ) to the gate of said field effect transistor; said control means further has a power detector (5) for detecting said output power of said power amplification circuit to give a converted direct-current signal (S 1 ) according thereto, and a reference signal souce (7) for giving a predetermined reference signal (S 2 ) while it is continuously energized; said control circuit comprises an amplifier (6) for amplifying the difference between said converted signal and said reference signal to produce said control signal; and said reference signal source is adapted to cause, in the closing stage of energization thereof, said reference signal to fall with a predetermined time-constant.
Claim 4
Dependent Claim
213 words
A high-frequency oscillator, comprising: an oscillation circuit (1) having a high-frequency oscillatory element (X) and an amplifying element (Q 2 ) for amplifying the output of said oscillatory element; a power amplification circuit (3) for amplifying the power of a high-frequency output of said oscillation circuit; control means (Q 7 , 6) for varying a bias voltage of said amplifying element to thereby control the output power of said power amplification circuit; said control means having a field effect transistor (Q 7 ) connected at the drain thereof to said amplifying element and a control circuit (6) for applying a direct-current control signal (S 3 ) to the gate of said field effect transistor; said control means further has a power detector (5) for detecting said output power of said power amplification circuit to give a converted direct-current signal (S 1 ) according thereto, and a reference signal souce (7) for giving a predetermined reference signal (S 2 ) while it is continuously energized; said control circuit comprises an amplifier (6) for amplifying the difference between said converted signal and said reference signal to produce said control signal; and said reference signal source is adapted to cause, in the closing stage of energization thereof, said reference signal to fall with a predetermined time-constant.
Claim 5
Dependent Claim
212 words
A high-frequency oscillator, comprising: an oscillation circuit (1) having a high-frequency oscillatory element (X) and amplifying element (Q 2 ) for amplifying the output of said oscillatory element; a power amplification circuit (3) for amplifying the power of a high-frequency output of said oscillation circuit; control means (Q 7 , 6) for varying a bias voltage of said amplifying element to thereby control the output power of said power amplification circuit; said control means having a field effect transistor (Q 7 ) connected at the drain thereof to said amplifying element and a control circuit (6) for applying a direct-current control signal (S 3 ) to the gate of said field effect transistor; said power amplification circuit comprises a metal-oxide semi-conductor type field effect transistor (Q 3 , Q 4 , Q 5 , Q 6 ); said control means further has a power detector (5) for detecting said output power of said power amplification circuit to give a converted direct-current signal (S 1 ) according thereto, and a reference signal source (7) for giving a predetermined reference signal (S 2 ) while it is continuously energized; and said control circuit comprises an amplifier (6) for amplifying the difference between said converted signal and said reference signal to produce said control signal.
Claim 6
Dependent Claim
212 words
A high-frequency oscillator, comprising: an oscillation circuit (1) having a high-frequency oscillatory element (X) and amplifying element (Q 2 ) for amplifying the output of said oscillatory element; a power amplification circuit (3) for amplifying the power of a high-frequency output of said oscillation circuit; control means (Q 7 , 6) for varying a bias voltage of said amplifying element to thereby control the output power of said power amplification circuit; said control means having a field effect transistor (Q 7 ) connected at the drain thereof to said amplifying element and a control circuit (6) for applying a direct-current control signal (S 3 ) to the gate of said field effect transistor; said power amplification circuit comprises a metal-oxide semi-conductor type field effect transistor (Q 3 , Q 4 , Q 5 , Q 6 ); said control means further has a power detector (5) for detecting said output power of said power amplification circuit to give a converted direct-current signal (S 1 ) according thereto, and a reference signal source (7) for giving a predetermined reference signal (S 2 ) while it is continuously energized; and said control circuit comprises an amplifier (6) for amplifying the difference between said converted signal and said reference signal to produce said control signal.
Claim 7
Dependent Claim
32 words
A high-frequency oscillator according to claim 3, wherein: said output power of said power amplification circuit is variable between a minimum value and a stationary value in accordance with said control signal.
Claim 8
Dependent Claim
20 words
A high-frequency oscillator according to claim 4, wherein: said control signal is relatively slow in the speed of variation thereof.
Claim 9
Dependent Claim
32 words
A high-frequency oscillator according to claim 3, wherein: said reference signal source is adapted to cause, in the initial stage of energization thereof, said reference signal to rise with a predetermined time-constant.
Claim 10
Dependent Claim
33 words
A high-frequency oscillator according to claim 3, wherein: said reference signal source is adapted to cause, in the closing stage of energization thereof, said reference signal to fall with a predetermined time constant.
References Cited (Backward Citations)
US3134947A
Cited
JPS55143841A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-17 | 1989-09-16 | 1990-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-17 | 1993-09-16 | 1994-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-17 | 1997-09-16 | 1998-03-18 | $7700.00 | Window Closed / Lapsed |