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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 |
| 5668501 |
Transconductance amplifier having a digitally variable transconductance as well as a variable gain stage and an automatic gain control circuit comprising such a variable gain stage |
Sep. 16, 1997 |
| 5663684 |
Wafer-stage adjustment for compensating for mismatches in temperature dependent IC components |
Sep. 2, 1997 |
| 5661437 |
Negative feedback variable gain amplifier circuit |
Aug. 26, 1997 |
| 5623228 |
Non-linear feedback network providing a linear transfer function |
Apr. 22, 1997 |
| 5602511 |
Capacitive transimpedance amplifier having dynamic compression |
Feb. 11, 1997 |
| 5602510 |
Automatic transimpedance control amplifier having a variable impedance feedback |
Feb. 11, 1997 |
| 5590412 |
Communication apparatus using common amplifier for transmission and reception |
Dec. 31, 1996 |
| 5581213 |
Variable gain amplifier circuit |
Dec. 3, 1996 |
| 5570064 |
Automatic gain control amplifier for use in radio transmitter-receiver |
Oct. 29, 1996 |
| 5546050 |
Radio frequency bus leveling system |
Aug. 13, 1996 |
| 5543759 |
Audio amplification circuits |
Aug. 6, 1996 |
| 5525929 |
Transimpedance amplifier circuit with feedback and load resistor variable circuits |
Jun. 11, 1996 |
| 5523721 |
Digitally controlled variable gain circuit |
Jun. 4, 1996 |
| 5517139 |
Non-linear circuit and chaotic neuron circuit using the same |
May. 14, 1996 |
| 5491450 |
Low power consumption process-insensitive feedback amplifier |
Feb. 13, 1996 |
| 5486791 |
Programmable gain amplifier |
Jan. 23, 1996 |
| 5483200 |
Light-receiving and amplifying device capable of switching between gain levels at high speed and obtaining a sufficient signal-to-noise ratio over a wide range in quantity of incident light |
Jan. 9, 1996 |
| 5472232 |
Air bag system for saving life in a crash |
Dec. 5, 1995 |
| 5451904 |
Amplifying circuit in which variable impedance circuit is used in negative feedback circuit |
Sep. 19, 1995 |
| 5442321 |
Automatic transimpedance control amplifier |
Aug. 15, 1995 |
| 5412346 |
Variable gain voltage signal amplifier |
May. 2, 1995 |
| 5410271 |
Non-linear feedback network providing a linear transfer function |
Apr. 25, 1995 |
| 5408197 |
Automatic power control circuit for controlling transmitting power of modulated radio frequency signal |
Apr. 18, 1995 |
| 5392464 |
Directional detector for power level control |
Feb. 21, 1995 |
| 5389896 |
HBT monolithic variable gain amplifier with bias compensation and buffering |
Feb. 14, 1995 |
| 5387879 |
Gain controllable output buffer amplifier circuit having a reduced circuit area |
Feb. 7, 1995 |
| 5373243 |
Impedance transformation circuit with matched current sources |
Dec. 13, 1994 |
| 5371477 |
Linear amplifier |
Dec. 6, 1994 |
| 5363055 |
Photodiode preamplifier with programmable gain amplification |
Nov. 8, 1994 |
| 5355096 |
Compace HBT wide band microwave variable gain active feedback amplifier |
Oct. 11, 1994 |
| 5331290 |
Variable gain amplifier |
Jul. 19, 1994 |
| 5327098 |
Programmable gain amplifier circuitry and method for biasing JFET gain switches thereof |
Jul. 5, 1994 |
| 5325071 |
Operational amplifier with digitally programmable gain circuitry on the same chip |
Jun. 28, 1994 |
| 5319318 |
Gain control circuit and semiconductor device |
Jun. 7, 1994 |
| 5291151 |
Sensor amplifier |
Mar. 1, 1994 |
| 5285169 |
Monolithic integrated differential amplifier with digital gain setting |
Feb. 8, 1994 |
| 5245229 |
Digitally controlled integrated circuit anti-clipping mixer |
Sep. 14, 1993 |
| 5233309 |
Programmable gain amplifier |
Aug. 3, 1993 |
| 5231360 |
Multi-range voltage amplifier having multiplying digital/analog converters and programmable filter using multiplying DAC in feedback loop |
Jul. 27, 1993 |
| 5229720 |
VCA circuit |
Jul. 20, 1993 |
| 5216385 |
Resistorless trim amplifier using MOS devices for feedback elements |
Jun. 1, 1993 |
| 5210502 |
Servo distortion trim for DBX VCA |
May. 11, 1993 |
| 5206603 |
Circuit arrangement with electronically controllable transfer characteristic |
Apr. 27, 1993 |
| 5180988 |
Resistorless trim amplifier using MOS devices for feedback elements |
Jan. 19, 1993 |
| 5175508 |
Voltage-controlled amplifier using operational amplifier |
Dec. 29, 1992 |
| 5138280 |
Multichannel amplifier with gain matching |
Aug. 11, 1992 |
| 5121075 |
Precision programmable attenuator |
Jun. 9, 1992 |
| 5063287 |
Processing circuit for optical combustion monitor |
Nov. 5, 1991 |
| 5051707 |
Gain control circuit for amplifier having stepwise variable gain |
Sep. 24, 1991 |
| 5051705 |
Gain-tilt amplifier |
Sep. 24, 1991 |
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