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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
6630861 Variable gain amplifier Oct. 7, 2003
6621343 Open loop variable gain amplifier using replica gain cell Sep. 16, 2003
6614300 Dual current mirror power amplifier bias control Sep. 2, 2003
6577190 Linear gain control amplifier Jun. 10, 2003
6559717 Method and/or architecture for implementing a variable gain amplifier control May. 6, 2003
6538507 Automatic gain control circuit with high linearity and monotonically correlated offset voltage Mar. 25, 2003
6535068 System and method for temperature compensated IF amplifier Mar. 18, 2003
6492872 High frequency power amplifying module and wireless communication apparatus Dec. 10, 2002
6492869 Linear amplifier and radio communication apparatus using the same Dec. 10, 2002
6480068 Hardware assisted automatic gain control for digital subscriber line modems Nov. 12, 2002
6441686 Offset correction method and apparatus Aug. 27, 2002
6404283 Method and apparatus for amplifying a radio frequency signal Jun. 11, 2002
6380804 Method and apparatus for switching stages of a multistage amplifier quickly between operational modes Apr. 30, 2002
6359518 Signal level adjusting circuit using coupling stage for preventing variation from resulting in each operating point of first amplifying stage and second amplifying stage Mar. 19, 2002
6339361 Power amplifier driver system for wireless handset Jan. 15, 2002
6333675 Variable gain amplifier with gain control voltage branch circuit Dec. 25, 2001
6329879 High frequency power amplifier system and wireless communication system Dec. 11, 2001
6326842 Variable gain amplifying apparatus which can change a gain during an operation Dec. 4, 2001
6323729 Amplifier arrangement with voltage gain and reduced power consumption Nov. 27, 2001
6297694 High frequency power amplifier Oct. 2, 2001
6259901 Radio-frequency power amplifier of mobile communication equipment Jul. 10, 2001
6259318 Method for extending the liner range of an amplifier Jul. 10, 2001
6236266 Bias circuit and bias supply method for a multistage power amplifier May. 22, 2001
6229397 Automatic gain control circuit receiving apparatus incorporating said circuit automatic gain control method adaptable to receiving apparatus and recording medium May. 8, 2001
6208209 Automatic gain control circuit using a capacitor for minimizing digital coupling Mar. 27, 2001
6172567 Radio communication apparatus and radio frequency power amplifier Jan. 9, 2001
6127890 Variable gain circuit with improved gain response Oct. 3, 2000
6121838 Precision GaAs low-voltage DC amplifier Sep. 19, 2000
6122491 Communications system using power amplifier with dynamic biasing Sep. 19, 2000
6025753 Method and apparatus for amplifying a signal Feb. 15, 2000
6018270 Low voltage RF amplifier and mixed with single bias block and method Jan. 25, 2000
5901347 Fast automatic gain control circuit and method for zero intermediate frequency receivers and radiotelephone using same May. 4, 1999
5898347 Large signal attenuator Apr. 27, 1999
5898337 Output signal level control circuit using different detecting sections in different output signal levels Apr. 27, 1999
5886575 Apparatus and method for amplifying a signal Mar. 23, 1999
5867063 Gain distribution circuit Feb. 2, 1999
5841320 Variable gain amplifying device Nov. 24, 1998
5825239 Peak detector for automatic gain control Oct. 20, 1998
5815804 Dual-band filter network Sep. 29, 1998
5757229 Bias circuit for a power amplifier May. 26, 1998
5621359 Gain selection technique Apr. 15, 1997
5606285 Power control circuit for use with transmitter Feb. 25, 1997
5589796 Method and apparatus for increasing amplifier efficiency Dec. 31, 1996
5451901 Transconductance amplifiers and exponential variable gain amplifiers using the same Sep. 19, 1995
5442321 Automatic transimpedance control amplifier Aug. 15, 1995
5438298 Amplifier having overshoot preventing circuit Aug. 1, 1995
5432473 Dual mode amplifier with bias control Jul. 11, 1995
5422601 Hybrid analog digital automatic gain control gain recovery system Jun. 6, 1995
5376895 Control circuit and method for transmission output Dec. 27, 1994
5309115 Burst control circuit for use in TDMA communications system May. 3, 1994

1 2 3

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