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Class Information
Number: 330/144
Name: Amplifiers > Variable impedance for signal channel controlled by separate control path
Description: Subject matter wherein there is provided for the signal transmission path a variable impedance element or circuit which may be a variable resistance, or reactance, whose impedance is controlled by a separate control means.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7400164 |
Integrated circuit and method of improving signal integrity |
Jul. 15, 2008 |
| 7352238 |
dB-linear analog variable gain amplifier (VGA) realization system and method |
Apr. 1, 2008 |
| 7292096 |
Amplifier |
Nov. 6, 2007 |
| 7292829 |
Power amplifier efficiency |
Nov. 6, 2007 |
| 7289575 |
Signal processing means |
Oct. 30, 2007 |
| 7286012 |
Operational amplifier circuit with controllable intermediate circuitry set therein |
Oct. 23, 2007 |
| 7279968 |
Amplifier output voltage swing extender circuit and method |
Oct. 9, 2007 |
| 7239205 |
High frequency amplifier circuit and mobile communication terminal using the same |
Jul. 3, 2007 |
| 7202747 |
Self-tuning variable impedance circuit for impedance matching of power amplifiers |
Apr. 10, 2007 |
| 7135931 |
Negative conductance power amplifier |
Nov. 14, 2006 |
| 7110742 |
Low noise amplifier with constant input impedance |
Sep. 19, 2006 |
| 7106132 |
Feed-forward operational amplifiers and methods of using the same |
Sep. 12, 2006 |
| 7071782 |
HF amplifier with switchable gain |
Jul. 4, 2006 |
| 6985021 |
Circuits and techniques for conditioning differential signals |
Jan. 10, 2006 |
| 6965837 |
Method and arrangement for detecting load mismatch, and a radio device utilizing the same |
Nov. 15, 2005 |
| 6958648 |
Programmable gain amplifier with glitch minimization |
Oct. 25, 2005 |
| 6952144 |
Apparatus and method to provide power amplification |
Oct. 4, 2005 |
| 6906584 |
Switchable gain amplifier having a high-pass filter pole |
Jun. 14, 2005 |
| 6888405 |
Programmable gain amplifier with glitch minimization |
May. 3, 2005 |
| 6861903 |
Signal coupling systems with enhanced isolation and dynamic range |
Mar. 1, 2005 |
| 6836184 |
Network amplifier with microprocessor control |
Dec. 28, 2004 |
| 6825717 |
Feedback network and amplifier and/or converter circuit with a feedback network |
Nov. 30, 2004 |
| 6803818 |
Method and apparatus for improved output power level control in an amplifier circuit |
Oct. 12, 2004 |
| 6774717 |
Transmitter including a composite amplifier |
Aug. 10, 2004 |
| 6768472 |
Active impedance matching in communications systems |
Jul. 27, 2004 |
| 6750708 |
Miniaturized buffer amplifier and electronic circuit unit using same |
Jun. 15, 2004 |
| 6731915 |
Combined RF power detector and power precorrector |
May. 4, 2004 |
| 6724253 |
Predistortion type linearizer controlled by two control voltages |
Apr. 20, 2004 |
| 6724897 |
Amplifier with alternate output level |
Apr. 20, 2004 |
| 6720828 |
Apparatus and method for compensating a high impedance attenuator |
Apr. 13, 2004 |
| 6710647 |
Method and circuit for distortion compensation and output control |
Mar. 23, 2004 |
| 6657489 |
Operational amplifier circuit with improved feedback factor |
Dec. 2, 2003 |
| 6646505 |
Power amplifier array with same type predistortion amplifier |
Nov. 11, 2003 |
| 6639464 |
Composite amplifier |
Oct. 28, 2003 |
| 6608603 |
Active impedance matching in communications systems |
Aug. 19, 2003 |
| 6590436 |
System and method of translating wide common mode voltage ranges into narrow common mode voltage ranges |
Jul. 8, 2003 |
| 6580327 |
Electronically controllable slope equalizer |
Jun. 17, 2003 |
| 6580319 |
Amplitude and phase transfer linearization method and apparatus for a wideband amplifier |
Jun. 17, 2003 |
| 6577191 |
Automatic gain control circuit for analog signals |
Jun. 10, 2003 |
| 6570445 |
Linearizer for microwave amplifier |
May. 27, 2003 |
| 6556075 |
Amplifier system and method that approximate constant impedance and quiescent outputs during forward and reverse modes |
Apr. 29, 2003 |
| 6538508 |
Programmable gain amplifier with glitch minimization |
Mar. 25, 2003 |
| 6487250 |
Signal output system |
Nov. 26, 2002 |
| 6472940 |
Gigabit ethernet transceiver with analog front end |
Oct. 29, 2002 |
| 6466089 |
Control circuit for increasing the output inpedance of a transconductor |
Oct. 15, 2002 |
| 6466091 |
High order multi-path operational amplifier with reduced input referred offset |
Oct. 15, 2002 |
| 6448856 |
Electronic volume circuit |
Sep. 10, 2002 |
| 6373348 |
High speed differential attenuator using a low temperature co-fired ceramic substrate |
Apr. 16, 2002 |
| 5880635 |
Apparatus for optimizing the performance of a power amplifier |
Mar. 9, 1999 |
| 5812687 |
Circuit for controlling the frequency and/or phase response of a signal amplification system |
Sep. 22, 1998 |
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