US3735272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic gain control
Assignee: United States Department of the Navy
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Filing: 1971-10-20
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Granted: 1973-05-22
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Expires: 1991-10-20
Abstract
Abstract An automatic gain control wherein the gain is maintained at a level just low enough to prevent saturation by noise and clutter. The gain slowly increases at a highly linear rate until a threshold value is exceeded; then the gain is rapidly reduced. Likewise, when a signal exceeding the threshold value is received, the gain is rapidly reduced to maintain a level below saturation.
Inventors
- 👤 R Nyswander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:04
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
172 words
An automatic gain control for maintaining the gain of an electronic circuit at a level just below that which would cause saturation of the circuit, comprising: voltage comparing means for comparing an input signal to a reference voltage; pulse generating means coupled to said voltage comparing means for providing an electronic pulse output of predetermined amplitude and duration when said input signal becomes greater than said reference voltage; means for clamping the amplitude of said electronic pulse to a predetermined value; Means for amplifying said clamped electronic pulsle; and means coupled to said amplifier means for controlling the gain of said circuit, including means coupled to said gain control means for rapidly reducing the gain of said circuit in response to said amplified, clamped pulse; such that the rate of gain of said circuit increases at a constant predetermined rate until said input signal becomes greater than said reference voltage, at which time the rate of gain is rapidly reduced during said predetermined duration, and then again increases at said predetermined rate.
Claim 2
Dependent Claim
172 words
An automatic gain control for maintaining the gain of an electronic circuit at a level just below that which would cause saturation of the circuit, comprising: voltage comparing means for comparing an input signal to a reference voltage; pulse generating means coupled to said voltage comparing means for providing an electronic pulse output of predetermined amplitude and duration when said input signal becomes greater than said reference voltage; means for clamping the amplitude of said electronic pulse to a predetermined value; Means for amplifying said clamped electronic pulsle; and means coupled to said amplifier means for controlling the gain of said circuit, including means coupled to said gain control means for rapidly reducing the gain of said circuit in response to said amplified, clamped pulse; such that the rate of gain of said circuit increases at a constant predetermined rate until said input signal becomes greater than said reference voltage, at which time the rate of gain is rapidly reduced during said predetermined duration, and then again increases at said predetermined rate.
Claim 3
Dependent Claim
13 words
The control of claim 1 wherein said gain reducing means comprises an integrator.
Claim 4
Dependent Claim
30 words
The control of claim 2 wherein said gain control means further includes a gain increasing means having an integrator which includes part of said integrator of said gain reducing means.
Claim 5
Dependent Claim
14 words
The control of claim 3 wherein said pulse generating means is a single-shot multivibrator.
Claim 6
Dependent Claim
26 words
The control of claim 4 wherein said control further comprises a linearizing circuit coupled to the output of said integrator to compensate for any circuit non-linearity.
References Cited (Backward Citations)
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |