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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 |
| 6876253 |
Amplifier for alternating signals superimposed on a continuous signal and method for amplifying such signals |
Apr. 5, 2005 |
| 6859105 |
Variable gain control circuit and integrated circuit device having the same |
Feb. 22, 2005 |
| 6844709 |
Programmable voltage supervisory circuit and method with minimum programming pins and low quiescent current |
Jan. 18, 2005 |
| 6833759 |
System and method for a programmable gain amplifier |
Dec. 21, 2004 |
| 6818879 |
Amplifier circuit for optical disk drive |
Nov. 16, 2004 |
| 6806771 |
Multimode output stage converting differential to single-ended signals using current-mode input signals |
Oct. 19, 2004 |
| 6798284 |
Variable-impedance reference circuit and varying method |
Sep. 28, 2004 |
| 6734817 |
A/D converter, method of A/D conversion, and signal processing device |
May. 11, 2004 |
| 6724251 |
Apparatus and method for employing gain dependent biasing to reduce offset and noise in a current conveyor type amplifier |
Apr. 20, 2004 |
| 6710648 |
Amplifying circuit capable of limiting amplitude of output signal supplied to a speaker |
Mar. 23, 2004 |
| 6693491 |
Method and apparatus for controlling an audio signal level |
Feb. 17, 2004 |
| 6693490 |
Adjustable gain control system and method thereof |
Feb. 17, 2004 |
| 6646509 |
Layout technique for matched resistors on an integrated circuit substrate |
Nov. 11, 2003 |
| 6633191 |
Clock buffer with DC offset suppression |
Oct. 14, 2003 |
| 6621346 |
Impedance matching for programmable gain amplifiers |
Sep. 16, 2003 |
| 6603347 |
Amplifier having controllable input impedance |
Aug. 5, 2003 |
| 6586994 |
Variable gain and low noise amplifier for received signals in imaging apparata |
Jul. 1, 2003 |
| 6583671 |
Stable AGC transimpedance amplifier with expanded dynamic range |
Jun. 24, 2003 |
| 6577188 |
Variable gain amplifier |
Jun. 10, 2003 |
| 6577191 |
Automatic gain control circuit for analog signals |
Jun. 10, 2003 |
| 6556083 |
Method and apparatus for maintaining stability in a circuit under variable load conditions |
Apr. 29, 2003 |
| 6549075 |
Method of configuring a switch network for programmable gain amplifiers |
Apr. 15, 2003 |
| 6538833 |
System and method for improving frequency response in a magneto-resistive preamplifier |
Mar. 25, 2003 |
| 6538508 |
Programmable gain amplifier with glitch minimization |
Mar. 25, 2003 |
| 6509792 |
Circuit and method for attenuating or eliminating undesired properties of an operational amplifier |
Jan. 21, 2003 |
| 6507242 |
Gain switching scheme for amplifiers with digital automatic gain control |
Jan. 14, 2003 |
| 6504429 |
Wide dynamic range transimpedance amplifier |
Jan. 7, 2003 |
| 6462621 |
Operational amplifier that is configurable as a progammable gain amplifier of a general purpose amplifier |
Oct. 8, 2002 |
| 6459340 |
Power amplifier mismatch protection with clamping diodes in RF feedback circuit |
Oct. 1, 2002 |
| 6452452 |
Negative feedback gain control for common electrode transistor |
Sep. 17, 2002 |
| 6448860 |
Device for converting small currents impressed at the input of the device by a non-ideal electric source of current into voltage signals |
Sep. 10, 2002 |
| 6426677 |
Linearization bias circuit for BJT amplifiers |
Jul. 30, 2002 |
| 6424221 |
Programmable gain amplifier for use in data network |
Jul. 23, 2002 |
| 6407633 |
Methods and apparatus for stabilizing feedback-controlled amplifiers |
Jun. 18, 2002 |
| 6404282 |
Preamplification circuit |
Jun. 11, 2002 |
| 6404281 |
Wide dynamic range transimpedance amplifier |
Jun. 11, 2002 |
| 6400218 |
Variable gain control circuit for a receiver and method therefor |
Jun. 4, 2002 |
| 6400221 |
Audio amplifier system with discrete digital frequency selective damping factor controls |
Jun. 4, 2002 |
| 6396934 |
Analog audio filter for high frequencies |
May. 28, 2002 |
| 6392478 |
Amplification device having an adjustable bandwidth |
May. 21, 2002 |
| RE37708 |
Programmable bandwidth voltage regulator |
May. 21, 2002 |
| 6388525 |
Amplifier with controllable variable signal gain |
May. 14, 2002 |
| 6384689 |
Preamplifier for optical receivers |
May. 7, 2002 |
| 6369644 |
Filter circuit |
Apr. 9, 2002 |
| 6362684 |
Amplifier having an adjust resistor network |
Mar. 26, 2002 |
| 6353364 |
Digitally gain controllable amplifiers with analog gain control input, on-chip decoder and programmable gain distribution |
Mar. 5, 2002 |
| 6333674 |
Feedback stabilization apparatus and methods |
Dec. 25, 2001 |
| 6310518 |
Programmable gain preamplifier |
Oct. 30, 2001 |
| 6297701 |
Wide dynamic range transimpedance amplifier |
Oct. 2, 2001 |
| 6288669 |
Switched capacitor programmable gain and attenuation amplifier circuit |
Sep. 11, 2001 |
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