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Class Information
Number: 330/282
Name: Amplifiers > With semiconductor amplifying device (e.g., transistor) > Including gain control means > Having feedback means acting as variable impedance
Description: Subject matter including a feedback means acting as a variable impedance to control the gain of the amplifier.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 5047731 |
Variable gain wideband bipolar monolithic amplifier |
Sep. 10, 1991 |
| 5034699 |
Trimming of operational amplifier gain |
Jul. 23, 1991 |
| 4999583 |
Amplifier drive controller |
Mar. 12, 1991 |
| 4942368 |
Signal feedback amplifier for a cable-TV converter |
Jul. 17, 1990 |
| 4918397 |
Gain control circuit |
Apr. 17, 1990 |
| 4888810 |
Analog volume control circuit |
Dec. 19, 1989 |
| 4881047 |
Automatic gain expansion system |
Nov. 14, 1989 |
| 4873492 |
Amplifier with modulated resistor gain control |
Oct. 10, 1989 |
| 4870369 |
Circuit arrangement having a pre-amplifier connected to an opto-electric transducer |
Sep. 26, 1989 |
| 4864248 |
Amplifier arrangement with controllable gain |
Sep. 5, 1989 |
| 4855685 |
Precision switchable gain circuit |
Aug. 8, 1989 |
| 4843345 |
Output stage with automatic level control for power line signalling |
Jun. 27, 1989 |
| 4791385 |
Voltage controlled amplifier for symmetrical electrical signals |
Dec. 13, 1988 |
| 4779055 |
Device for amplifying and sampling high dynamic signals |
Oct. 18, 1988 |
| 4757192 |
Extended dynamic range optical receiver and signal amplifier apparatus |
Jul. 12, 1988 |
| 4755771 |
Equalizing circuit |
Jul. 5, 1988 |
| 4754232 |
Amplification gain adjusting circuit |
Jun. 28, 1988 |
| 4754224 |
Circuit arrangement for converting an input voltage into a proportional output signal |
Jun. 28, 1988 |
| 4739307 |
Multichannel predictive gain amplifier system |
Apr. 19, 1988 |
| 4730114 |
Circuit arrangement for electronically generating a resistor setting and audio system based thereon |
Mar. 8, 1988 |
| 4724702 |
LPP sensor interface circuit |
Feb. 16, 1988 |
| 4704584 |
Instantaneous floating point amplifier |
Nov. 3, 1987 |
| 4656871 |
Capacitor sensor and method |
Apr. 14, 1987 |
| 4628276 |
Logarithmically linearly controlled variable gain amplifier |
Dec. 9, 1986 |
| 4612514 |
Feedback amplifier |
Sep. 16, 1986 |
| 4608542 |
Bandwidth controlled data amplifier |
Aug. 26, 1986 |
| 4602172 |
High input impedance circuit |
Jul. 22, 1986 |
| 4599574 |
Selectable gain instrumentation amplifier |
Jul. 8, 1986 |
| 4577097 |
Three-mode analog controller with remote tuning |
Mar. 18, 1986 |
| 4562405 |
Multiplexed buffer |
Dec. 31, 1985 |
| 4560948 |
Circuit for increasing voltage gain |
Dec. 24, 1985 |
| 4551685 |
Programmable gain feedback amplifier |
Nov. 5, 1985 |
| 4540952 |
Nonintegrating receiver |
Sep. 10, 1985 |
| 4535301 |
High frequency amplifier circuit |
Aug. 13, 1985 |
| 4523156 |
Anti-distortion anti-transient tone control circuit |
Jun. 11, 1985 |
| 4516041 |
Voltage controlled variable capacitor |
May. 7, 1985 |
| 4509021 |
Circuit for amplifying and/or attenuating a signal |
Apr. 2, 1985 |
| 4500845 |
Programmable attenuator |
Feb. 19, 1985 |
| 4499430 |
Automatic level control circuit |
Feb. 12, 1985 |
| 4490734 |
Variable impedance circuit employing an RIS field effect transistor |
Dec. 25, 1984 |
| 4484089 |
Switched-capacitor conductance-control of variable transconductance elements |
Nov. 20, 1984 |
| 4484295 |
Control circuit and method for varying the output of a waveform generator to gradually or rapidly vary a control signal from an initial value to a desired value |
Nov. 20, 1984 |
| 4471324 |
All NPN variably controlled amplifier |
Sep. 11, 1984 |
| 4459557 |
Compressor limiter for audio signal processing |
Jul. 10, 1984 |
| 4451795 |
Circuit arrangement with controllable transfer characteristic at higher frequencies |
May. 29, 1984 |
| 4450413 |
Automatic signal level control device |
May. 22, 1984 |
| 4441080 |
Amplifier with controlled gain |
Apr. 3, 1984 |
| 4439739 |
Circuit arrangement with electronically controllable transfer characteristic |
Mar. 27, 1984 |
| 4439741 |
Stabilized high efficiency radio frequency amplifier |
Mar. 27, 1984 |
| 4435679 |
Programmable signal amplitude control circuits |
Mar. 6, 1984 |
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