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Class Information
Number: 330/134
Name: Amplifiers > With control of power supply or bias voltage > With control of input electrode or gain control electrode bias > Plural different bias control voltages provided by separate means
Description: Subject matter including at least two separate and distinct bias voltage control means as therein defined, wherein the control voltages are applied to input or gain control electrodes, and which may be applied to a single amplifying device or to more than one amplifying device.

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8542064 Methods and apparatus to control power in a printer Sep. 24, 2013
8339204 Semiconductor device Dec. 25, 2012
8335478 Communication device Dec. 18, 2012
8159294 Multi-voltage headphone drive circuit Apr. 17, 2012
8106709 Pre and post filter automatic gain control with bounded pre-filter gain control Jan. 31, 2012
8081777 Volume-based adaptive biasing Dec. 20, 2011
7952434 Semiconductor device May. 31, 2011
7719354 Dynamic biasing system for an amplifier May. 18, 2010
7647044 RF switching device Jan. 12, 2010
7629853 Amplifying apparatus and bias stabilization circuit Dec. 8, 2009
7629851 High frequency power amplifier circuit and electronic component for high frequency power amplifier Dec. 8, 2009
7554395 Automatic low battery compensation scaling across multiple power amplifier stages Jun. 30, 2009
7512387 Method and control system for controlling the output power of an RF amplifier system Mar. 31, 2009
7499502 Amplifier, information communication apparatus and amplification method Mar. 3, 2009
7443245 High frequency power amplifier circuit and electronic component for high frequency power amplifier Oct. 28, 2008
7405617 Dynamic biasing system for an amplifier Jul. 29, 2008
7378881 Variable gain amplifier circuit May. 27, 2008
7355477 Transmitter power control loop for high-speed wireless LANs Apr. 8, 2008
7345537 Linear power amplifier with multiple output power levels Mar. 18, 2008
7227415 High frequency power amplifier circuit and radio communication system Jun. 5, 2007
7199657 Amplification gain stages having replica stages for DC bias control Apr. 3, 2007
7193459 Power amplifier control technique for enhanced efficiency Mar. 20, 2007
7167718 Transmission power control apparatus, transmission power control method, and mobile station Jan. 23, 2007
7123094 High frequency power amplifier circuit and radio communication system Oct. 17, 2006
7109791 Tailored collector voltage to minimize variation in AM to PM distortion in a power amplifier Sep. 19, 2006
7098732 Multi-stage variable gain amplifier utilizing overlapping gain curves to compensate for log-linear errors Aug. 29, 2006
7072130 Auto-ranging attenuators for read channels Jul. 4, 2006
7071782 HF amplifier with switchable gain Jul. 4, 2006
7038538 Folded cascode high voltage operational amplifier with class AB source follower output stage May. 2, 2006
7012464 Method and circuit for a dual supply amplifier Mar. 14, 2006
6937097 High-frequency power amplifier having differential inputs Aug. 30, 2005
6927630 RF power detector Aug. 9, 2005
6922093 Radio frequency amplifier and method of driving the same Jul. 26, 2005
6917244 Power control for a switching mode power amplifier Jul. 12, 2005
6903611 Automatic gain control device Jun. 7, 2005
6900694 High frequency power amplifier module and wireless communication apparatus May. 31, 2005
6828854 Method and circuit for a dual supply amplifier Dec. 7, 2004
6816013 Automatic gain control device Nov. 9, 2004
6788138 Transmission power control circuit Sep. 7, 2004
6778616 Radio reception apparatus and received power amplification method Aug. 17, 2004
6771124 System and method for low-noise amplifier with a high frequency response Aug. 3, 2004
6731167 High frequency power amplifier module and wireless communication apparatus May. 4, 2004
6727754 RF power detector Apr. 27, 2004
6724252 Switched gain amplifier circuit Apr. 20, 2004
6710662 Power amplifier with improved linearity and reduced transistor stacks Mar. 23, 2004
6696892 Large dynamic range programmable gain attenuator Feb. 24, 2004
6646510 Method of adjusting gain and current consumption of a power amplifier circuit while maintaining linearity Nov. 11, 2003
6642783 Amplification device with optimized linearity Nov. 4, 2003
6639461 Ultra-wideband power amplifier module apparatus and method for optical and electronic communications Oct. 28, 2003
6636114 High frequency power amplifier module and wireless communication apparatus Oct. 21, 2003

1 2 3

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