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Class Information
Number: 330/199
Name: Amplifiers > With power or bias voltage supply
Description: Subject matter in which the "source of electrical energy" controlled by the signal input; or biasing means applied to the "amplifying device", or the means to apply such energy or bias, such as the circuits through which such source or bias is applied; or means for isolating such source or biasing means from the signal path or other amplifier circuits (by filters, isolating resistors, or other means), is significantly claimed, and which subject matter is not provided for in any of the previous subclasses.

Sub-classes under this class:

Class Number Class Name Patents
330/202 For anode 27
330/206 For filamentary cathode 3
330/204 For input electrode 2
330/200 For plural stage amplifier 17

Patents under this class:
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Patent Number Title Of Patent Date Issued
8680916 High efficiency variable voltage supply Mar. 25, 2014
8193860 Method and apparatus for automatically controlling an XNN.RTM. enhancement circuitry feeding a power amplifier Jun. 5, 2012
8189816 Computer controlled amplifier and speaker system with power conservation feature May. 29, 2012
8169261 High efficiency amplification May. 1, 2012
8159294 Multi-voltage headphone drive circuit Apr. 17, 2012
8139792 Amplifier circuits, methods of starting and stopping amplifier circuits Mar. 20, 2012
8068622 Method and apparatus for controlling a selectable voltage audio power output stage Nov. 29, 2011
8063513 Power source and method for controlling operational power Nov. 22, 2011
8054995 System, method and apparatus for adjusting an output of a transducer Nov. 8, 2011
8026766 Power circuits for power amplifiers and communication systems using the same Sep. 27, 2011
8023671 Piezoelectric buzzer driving circuit Sep. 20, 2011
7907664 Digital adaptive feedforward harmonic distortion compensation for digitally controlled power stage Mar. 15, 2011
7888998 Low-voltage CMOS error amplifier with implicit reference Feb. 15, 2011
7739522 Efficient power supply for rapidly changing power requirements Jun. 15, 2010
7675544 System and method for video transmission line fault detection Mar. 9, 2010
7571415 Layout of power device Aug. 4, 2009
7551688 Waveforms for envelope tracking transmitter Jun. 23, 2009
7486939 Apparatus for removing distortions created by an amplifier Feb. 3, 2009
7482869 High efficiency amplification Jan. 27, 2009
7395038 High-efficiency modulating RF amplifier Jul. 1, 2008
7158646 Signal derived bias supply for electrostatic loudspeakers Jan. 2, 2007
7136058 Display apparatus, digital-to-analog conversion circuit and digital-to-analog conversion method Nov. 14, 2006
7099635 High-efficiency modulating RF amplifier Aug. 29, 2006
6970152 Stacked amplifier arrangement for graphics displays Nov. 29, 2005
6917245 Absolute power detector Jul. 12, 2005
6819226 Systems and methods for energy storage in land-based telemetry applications Nov. 16, 2004
6756849 Absolute power detector Jun. 29, 2004
6703080 Method and apparatus for VHF plasma processing with load mismatch reliability and stability Mar. 9, 2004
6687490 Transmission apparatus and method for a mobile communication terminal Feb. 3, 2004
6628791 Signal derived bias supply for electrostatic loudspeakers Sep. 30, 2003
6587511 Radio frequency transmitter and methods thereof Jul. 1, 2003
6366177 High-efficiency power modulators Apr. 2, 2002
6256482 Power- conserving drive-modulation method for envelope-elimination-and-restoration (EER) transmitters Jul. 3, 2001
6181796 Method and system which drives left, right, and subwoofer transducers with multichannel amplifier having reduced power supply requirements Jan. 30, 2001
4633190 Voltage and current source fluctuation compensator and method Dec. 30, 1986
4563660 Noise isolation system for high-speed circuits Jan. 7, 1986
4511856 Bootstrap power regulator for systems such as analog to digital converters Apr. 16, 1985
4210996 Trimming method for resistance value of polycrystalline silicon resistors especially used as semiconductor integrated circuit resistors Jul. 8, 1980
4189680 Isolated signal conditioner Feb. 19, 1980
4170761 Remotely powered intermediate amplifier for communications transmission Oct. 9, 1979
4166983 Circuit for limiting the output voltage of an amplifier Sep. 4, 1979
4158179 Amplifier circuit Jun. 12, 1979
4117418 Electric amplifier Sep. 26, 1978
4092609 Circuit for reducing ripple voltage May. 30, 1978
4092608 Electronic circuitry May. 30, 1978
4085381 Amplifiers Apr. 18, 1978
4066974 Isolation amplifier Jan. 3, 1978
4063185 Direct coupling type power amplifier circuit Dec. 13, 1977
4058776 Bias circuit for avalanche diodes Nov. 15, 1977
4031480 Circuit arrangement for the ungrounded transmission of signals through testing points in communication systems Jun. 21, 1977

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