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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:

Class Number Class Name Patents
330/145 Electron tube or diode as impedance 91

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8570139 Variable resister having resistance varying geometrically ratio and control method thereof Oct. 29, 2013
8514017 Variable gain amplifier and audio device Aug. 20, 2013
8471630 Fast settling reference voltage buffer and method thereof Jun. 25, 2013
8278999 Output buffer circuit capable of enhancing stability Oct. 2, 2012
8279002 Variable gain amplifier circuit Oct. 2, 2012
8160518 Multi-mode transceiver having tunable harmonic termination circuit and method therefor Apr. 17, 2012
8149059 Method and apparatus for compensating for gain changes in an amplifier circuit Apr. 3, 2012
8098094 Instrumentation input systems Jan. 17, 2012
8030996 Apparatus and method for automatic level control Oct. 4, 2011
7974599 Low noise amplifier with constant input impedance Jul. 5, 2011
7843261 Resistor network for programmable transconductance stage Nov. 30, 2010
7808314 Circuit for adjusting an impedance Oct. 5, 2010
7755424 Operational amplifier with resistance switch crossbar feedback Jul. 13, 2010
7741908 High speed amplifier with controllable amplification and output impedance and comparator using the same Jun. 22, 2010
7741710 Module with multiple power amplifiers and power sensors Jun. 22, 2010
7702119 Multi-input gain control circuit Apr. 20, 2010
7639076 Gain controlled amplifier and cascoded gain controlled amplifier based on the same Dec. 29, 2009
7609116 Integrated amplifier arrangement Oct. 27, 2009
7592873 Low noise amplifier Sep. 22, 2009
7567122 Variable gain amplifiers systems and methods Jul. 28, 2009
7554394 Power amplifier circuit Jun. 30, 2009
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
7292829 Power amplifier efficiency Nov. 6, 2007
7292096 Amplifier 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
6724897 Amplifier with alternate output level Apr. 20, 2004
6724253 Predistortion type linearizer controlled by two control voltages Apr. 20, 2004

1 2 3

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