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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 |
| 4426624 |
Device and method for amplifying and sampling multiplexed signals |
Jan. 17, 1984 |
| 4424498 |
Adaptive equalizer |
Jan. 3, 1984 |
| 4406989 |
Automatic level control circuit |
Sep. 27, 1983 |
| 4399416 |
Floating point amplifier |
Aug. 16, 1983 |
| 4396890 |
Variable gain amplifier |
Aug. 2, 1983 |
| 4378527 |
Device for amplifying and sampling analog signals |
Mar. 29, 1983 |
| 4366440 |
Adjustable contrast compressor |
Dec. 28, 1982 |
| 4322636 |
Circuit system for the generation of a direct control voltage dependent upon an alternating voltage |
Mar. 30, 1982 |
| 4314207 |
Transistor amplifier |
Feb. 2, 1982 |
| 4292596 |
Gain control circuit |
Sep. 29, 1981 |
| 4278945 |
Circuit for the generation of a control variable for the control of the transfer constant of electronically actuable amplifying and attenuating members |
Jul. 14, 1981 |
| 4250411 |
Dynamic resistor current leakage compensation arrangement |
Feb. 10, 1981 |
| 4242650 |
Active variable equalizer |
Dec. 30, 1980 |
| 4234853 |
Automatic level control circuit |
Nov. 18, 1980 |
| 4224581 |
Compander system having limiter in compressor and expander |
Sep. 23, 1980 |
| 4219788 |
Active variable equalizer |
Aug. 26, 1980 |
| 4218662 |
Circuit arrangement for optional dynamic compression or expansion |
Aug. 19, 1980 |
| 4216434 |
Variable gain alternating voltage amplifier |
Aug. 5, 1980 |
| 4210873 |
Gain and impedance switching circuit for an amplifier |
Jul. 1, 1980 |
| 4209753 |
Amplifier programmable in gain and output polarity |
Jun. 24, 1980 |
| 4202238 |
Compressor-expander for a musical instrument |
May. 13, 1980 |
| 4194165 |
Miniature guitar amplifier |
Mar. 18, 1980 |
| 4184125 |
Analog tuning voltage circuit with analog signal multiplexing |
Jan. 15, 1980 |
| 4181896 |
Device for optional dynamic compression or expansion |
Jan. 1, 1980 |
| 4179669 |
Amplifying and equalizing |
Dec. 18, 1979 |
| 4170720 |
AGC circuit particularly for a hearing aid |
Oct. 9, 1979 |
| 4166981 |
Continuous signal amplitude regulator |
Sep. 4, 1979 |
| 4155048 |
Automatic gain control circuit |
May. 15, 1979 |
| 4152667 |
Gain-controlled signal amplifier |
May. 1, 1979 |
| 4137466 |
Controllable electronic resistance device |
Jan. 30, 1979 |
| 4132957 |
Programmable amplifier |
Jan. 2, 1979 |
| 4117416 |
Current mirror amplifiers with programmable current gains |
Sep. 26, 1978 |
| 4114105 |
Noise blanker circuit |
Sep. 12, 1978 |
| 4110708 |
Multichannel modulation system including automatic gain shifter |
Aug. 29, 1978 |
| 4101843 |
Automatic recording level control circuit with manual sensitivity compensating circuit |
Jul. 18, 1978 |
| 4100437 |
MOS reference voltage circuit |
Jul. 11, 1978 |
| 4099134 |
Amplifier with controllable transmission factor and switchable control characteristic |
Jul. 4, 1978 |
| 4084129 |
Voltage controlled variable gain circuit |
Apr. 11, 1978 |
| 4079334 |
Digitally controlled amplifying equipment |
Mar. 14, 1978 |
| 4069431 |
Amplifier circuit |
Jan. 17, 1978 |
| 4069461 |
Amplifier circuit having two negative feedback circuits |
Jan. 17, 1978 |
| 4052678 |
Noise floor indicative circuit |
Oct. 4, 1977 |
| 4050022 |
AM-FM receiver having improved mode conversion |
Sep. 20, 1977 |
| 4031504 |
Gain ranging amplifier system |
Jun. 21, 1977 |
| 4023112 |
Broad band amplifier having negative feedback and a controllable amplification factor |
May. 10, 1977 |
| 3991272 |
Audio AGC amplifier |
Nov. 9, 1976 |
| 3970949 |
High-frequency automatic gain control circuit |
Jul. 20, 1976 |
| 3969680 |
Automatic dynamic compander system |
Jul. 13, 1976 |
| 3940715 |
Distortion measurement system |
Feb. 24, 1976 |
| 3940707 |
Electronic devices for the automatic control of gain and roll-off in amplifiers |
Feb. 24, 1976 |
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