US4024463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A.C. amplifier automatic gain control fast attack circuit
Assignee: Boeing North American Inc
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Filing: 1976-05-03
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Granted: 1977-05-17
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Expires: 1996-05-03
Abstract
Abstract A fast-attack circuit is employed in an A.C. amplifier automatic gain control circuit to temporarily apply a D.C. gain control signal immediately to the amplifier circuit in response to a sudden signal increase in excess of a predetermined threshold level to avoid the problems of over-attack and pinch-down which might otherwise arise during the period required for the AGC loop to achieve stabilized control following the inception of the signal increase.
Inventors
- 👤 Arlo D. Pelley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:00
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3005
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
131 words
In combination with an A.C. amplifier circuit and an automatic gain control circuit having detector means for developing a D.C. signal proportional to the output amplitude of the amplifier circuit for controlling its output amplitude when the input signal thereto exceeds a predetermined AGC threshold level, a fast-attack circuit, comprising: means for detecting a rise in the level of the D.C. signal and providing an output signal whose magnitude is proportional thereto; control signal means for providing an enable signal whose duration is no greater than the stabilization period for the automatic gain control circuit in response to said output signal when its magnitude exceeds a predetermined threshold level, and switching means for applying the D.C. signal directly to the A.C. amplifier in response to the presence of said enable signal.
Claim 2
Dependent Claim
131 words
In combination with an A.C. amplifier circuit and an automatic gain control circuit having detector means for developing a D.C. signal proportional to the output amplitude of the amplifier circuit for controlling its output amplitude when the input signal thereto exceeds a predetermined AGC threshold level, a fast-attack circuit, comprising: means for detecting a rise in the level of the D.C. signal and providing an output signal whose magnitude is proportional thereto; control signal means for providing an enable signal whose duration is no greater than the stabilization period for the automatic gain control circuit in response to said output signal when its magnitude exceeds a predetermined threshold level, and switching means for applying the D.C. signal directly to the A.C. amplifier in response to the presence of said enable signal.
Claim 3
Dependent Claim
14 words
The fast-attack circuit of claim 1 wherein said detecting means is a differentiating circuit.
Claim 4
Dependent Claim
15 words
The fast-attack circuit of claim 1 wherein said control signal means comprises a one-shot multivibrator.
Claim 5
Dependent Claim
36 words
The fast-attack circuit of claim 1 including means for establishing a higher predetermined threshold level for said output signal when the amplifier circuit input signal exceeds the predetermined AGC threshold level than when it does not.
Claim 6
Dependent Claim
138 words
An A.C. amplifier automatic gain control circuit having a fast-attack means, comprising: D.c. detector means for developing a D.C. signal proportional to the output amplitude of the amplifier circuit; Agc control means for applying the D.C. signal to the amplifier circuit for controlling its output amplitude when the input signal thereto exceeds a predetermined AGC threshold level; means for detecting a rise in the level of the D.C. signal and providing an output signal whose magnitude is proportional thereto; control signal means for providing an enable signal whose duration is no greater than the stabilization period for the automatic gain control circuit in response to said output signal when its magnitude exceeds a predetermined threshold level, and switching means for applying the D.C. signal directly to the A.C. amplifier in response to the presence of said enable signal.
Claim 7
Dependent Claim
138 words
An A.C. amplifier automatic gain control circuit having a fast-attack means, comprising: D.c. detector means for developing a D.C. signal proportional to the output amplitude of the amplifier circuit; Agc control means for applying the D.C. signal to the amplifier circuit for controlling its output amplitude when the input signal thereto exceeds a predetermined AGC threshold level; means for detecting a rise in the level of the D.C. signal and providing an output signal whose magnitude is proportional thereto; control signal means for providing an enable signal whose duration is no greater than the stabilization period for the automatic gain control circuit in response to said output signal when its magnitude exceeds a predetermined threshold level, and switching means for applying the D.C. signal directly to the A.C. amplifier in response to the presence of said enable signal.
Claim 8
Dependent Claim
15 words
The gain control circuit of claim 5 wherein said detecting means is a differentiating circuit.
Claim 9
Dependent Claim
16 words
The gain control circuit of claim 5 wherein said control signal means comprises a one-shot multivibrator.
Claim 10
Dependent Claim
37 words
The gain control circuit of claim 5 including means for establishing a higher predetermined threshold level for said output signal when the amplifier circuit input signal exceeds the predetermined AGC threshold level than when it does not.
References Cited (Backward Citations)
US3230458A
Cited
US3620631A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |