Patent US3970949A successfully refreshed from Google Patents.
US3970949A
Expired / Lapsed
US
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High-frequency automatic gain control circuit
Assignee: Oki Electric Industry Co Ltd
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Filing: 1974-11-19
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Granted: 1976-07-20
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Expires: 1994-11-19
Abstract
Abstract A high-frequency automatic gain control circuit for a common emitter earthed amplifier wherein a hybrid negative feedback is applied to an input stage thereof from the emitter of an output stage transistor through a hybrid transformer connected to the base of an input stage transistor and a series negative feedback is applied to the output stage thereof, and according to the present invention a diode which is shunted by a capacitor is connected in series to an emitter resistor of the output stage transistor, and an automatic gain control signal is applied to said diode for regulating the gain of said amplifier by controlling negative feedback ratio of said negative feedback.
Inventors
- 👤 Michio Higuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:06
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3052
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
116 words
A high-frequency automatic gain control circuit for an emitter earthed amplifier wherein a hybrid negative feedback is applied to an input stage thereof from the emitter of an output stage transistor through a hybrid circuit connected to the base of an input stage transistor and a series negative feedback is applied to the output stage thereof, characterized in that a series connection of a diode and a capacitor is connected in shunt with an emitter resistor of the output stage transistor, and that an automatic gain control signal is applied to said diode between said diode and said capacitor for regulating the gain of said amplifier by controlling the negative feedback ratio of said negative feedback.
Claim 2
Dependent Claim
116 words
A high-frequency automatic gain control circuit for an emitter earthed amplifier wherein a hybrid negative feedback is applied to an input stage thereof from the emitter of an output stage transistor through a hybrid circuit connected to the base of an input stage transistor and a series negative feedback is applied to the output stage thereof, characterized in that a series connection of a diode and a capacitor is connected in shunt with an emitter resistor of the output stage transistor, and that an automatic gain control signal is applied to said diode between said diode and said capacitor for regulating the gain of said amplifier by controlling the negative feedback ratio of said negative feedback.
Claim 3
Dependent Claim
17 words
A high-frequency automatic gain control circuit according to claim 1, wherein said diode is a PIN diode.
Claim 4
Dependent Claim
29 words
A high-frequency automatic gain control circuit according to claim 1, wherein the collector of the input stage transistor is connected directly to the base of the output stage transistor.
References Cited (Backward Citations)
US3731216A
Cited
US3624561A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-20 | 1980-01-19 | 1980-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-20 | 1984-01-19 | 1984-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-20 | 1988-01-19 | 1988-07-20 | $7700.00 | Window Closed / Lapsed |