US3727146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear, voltage variable, temperature stable gain control
Assignee: United States Department of the Navy
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Filing: 1971-12-20
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Granted: 1973-04-10
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Expires: 1991-12-20
Abstract
Abstract An electronic gain control circuit having first and second differential amplifiers and an operational amplifier wherein the first differential amplifier is coupled to the input and provides the controlled output, the second differential amplifier is coupled to the first differential amplifier and controls the gain of the circuit, and the operational amplifier is coupled to the second differential amplifier for temperature stability and linearity.
Inventors
- 👤 R Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:48
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3005; H03G1/00; H03G1/0005; H03G1/0017; H03G1/0023
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
120 words
An electronic device for automatically controlling gain, comprising: an input; a first differential amplifier coupled to said input for providing the gain controlled output of said device; and gain controlling means coupled to said first differential amplifier for controlling the gain of said device and causing the output of said device to be linear and temperature stable, including an operational amplifier providing an output descriptive of the difference between the instantaneous gain and the preselected gain of the device, a control voltage coupled to one input of said operational amplifier, a second differential amplifier having at least one tranSistor, and means for coupling the voltage on the collector of one of said transistors to another input of said operational amplifier.
Claim 2
Dependent Claim
120 words
An electronic device for automatically controlling gain, comprising: an input; a first differential amplifier coupled to said input for providing the gain controlled output of said device; and gain controlling means coupled to said first differential amplifier for controlling the gain of said device and causing the output of said device to be linear and temperature stable, including an operational amplifier providing an output descriptive of the difference between the instantaneous gain and the preselected gain of the device, a control voltage coupled to one input of said operational amplifier, a second differential amplifier having at least one tranSistor, and means for coupling the voltage on the collector of one of said transistors to another input of said operational amplifier.
Claim 3
Dependent Claim
42 words
The device of claim 1 wherein: said first and second differential amplifiers are transistor circuits; and the base of the second transistor of said first differential amplifier is direct coupled to the base of the first transistor of said second differential amplifier.
Claim 4
Dependent Claim
75 words
The device of claim 2 wherein the collector of the second transistor of said second differential amplifier is coupled to another input of said operational amplifier and the output of said operational amplifier is coupled to said direct coupled bases, such that the operational amplifier provides a signal to the direct coupled bases in response to the difference between the control voltage and the collector voltage of the second transistor of the second differential amplifier.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |