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Class Information
Number: 330/129
Name: Amplifiers > With control of power supply or bias voltage > With control of input electrode or gain control electrode bias
Description: Subject matter wherein the "means to control the bias voltage" is applied to an input electrode of the amplifying device, or to an electrode separate and distinct from the signal input electrodes and in vacuum tube amplifiers also separate and distinct from the anode or screen grid electrodes in order to control the bias of such electrode.

Sub-classes under this class:

Class Number Class Name Patents
330/135 Amplitude limiting or bias voltage 36
330/136 Bias control signal from input of amplifier 513
330/138 Bias controlled by biased rectifier or discharge device 56
330/130 Bias controlled by separate external control source 31
330/142 Cathode resistor supplies bias (e.g., self-biasing circuits) 1
330/131 Control of bias on separate gain control electrode 14
330/133 Different bias control means for different stages of cascade amplifier 266
330/139 Electronic tube controls bias 12
330/132 Frequency selective means to select control signal from amplifier channel 35
330/137 Oscillator supplies or controls bias 29
330/134 Plural different bias control voltages provided by separate means 144
330/140 Rectifier in bias control circuit 113
330/141 Time constant circuit in bias control circuit 104

Patents under this class:
1 2 3 4 5 6 7 8 9 10 11 12

Patent Number Title Of Patent Date Issued
8659357 Conditionally-stable operational amplifier with tunable wideband buffers Feb. 25, 2014
8660221 Fast and robust AGC apparatus and method using the same Feb. 25, 2014
8624670 Method and apparatus for improving digital pre-distortion performance Jan. 7, 2014
8626084 Area efficient concurrent matching transceiver Jan. 7, 2014
8547173 Signal amplifying circuit and signal amplifying method Oct. 1, 2013
8515367 Transmission circuit and transmission method Aug. 20, 2013
8509707 Wireless communications device, gaming controller and integrated circuits with millimeter wave transceiver and methods for use therewith Aug. 13, 2013
8489030 Radio apparatus having first and second amplifiers and which performs direct current offset correction of the first and second amplifiers Jul. 16, 2013
8471629 Providing automatic power control for a power amplifier Jun. 25, 2013
8400217 RF power amplifier circuit with mismatch tolerance Mar. 19, 2013
8401129 Digital automatic gain control Mar. 19, 2013
8391349 Equalizer with automatic gain control (AGC) Mar. 5, 2013
8374294 Apparatus and method for automatic gain control Feb. 12, 2013
8374279 Modulation device for a transmission path, method for signal processing in a transmission path, and transmission path having the modulation device Feb. 12, 2013
8369446 Transmitter Feb. 5, 2013
8369466 Automatic gain control circuit, receiving apparatus and automatic gain control method Feb. 5, 2013
8369467 Automatic gain control system Feb. 5, 2013
8359076 Mobile wireless communications device having improved antenna impedance match and antenna gain from RF energy Jan. 22, 2013
8354883 Power amplifier Jan. 15, 2013
8351874 System and method for adaptive antenna impedance matching Jan. 8, 2013
8334721 Integrated upstream amplifier for cable modem and cable set-top boxes Dec. 18, 2012
8334722 Systems and methods of RF power transmission, modulation and amplification Dec. 18, 2012
8331882 VSWR normalizing envelope modulator Dec. 11, 2012
8310278 Voltage detection device Nov. 13, 2012
8310304 Power amplifier control system with gain calibration Nov. 13, 2012
8306490 High frequency power amplifier, transmitter and mobile communication terminal using the power amplifier Nov. 6, 2012
8280324 Method and system for closed loop power control in wireless systems Oct. 2, 2012
8270916 Methods for tuning and controlling output power in polar transmitters Sep. 18, 2012
8258875 DC-DC conversion for a power amplifier using the RF input Sep. 4, 2012
8259877 Method and device for automatic gain control with limited jitter Sep. 4, 2012
8254597 Audio signal processing circuit Aug. 28, 2012
8253489 Amplifier, transmitter, and method for compensating gain Aug. 28, 2012
8249275 Modulated gain audio control and zipper noise suppression techniques using modulated gain Aug. 21, 2012
8238868 Dynamic voltage scaling for packet-based data communication systems Aug. 7, 2012
8233857 Detector with bandwidth compensation Jul. 31, 2012
8229382 Switched current resistor programmable gain array for low-voltage wireless LAN and method using the same Jul. 24, 2012
8229372 Parallel forward path cartesian feedback loop and loop filter with switchable order for cartesian feedback loops Jul. 24, 2012
8219058 Radio receiver Jul. 10, 2012
8212481 Voltage control apparatus, power supply apparatus, electron tube and high-frequency circuit system Jul. 3, 2012
8198939 Amplifier with automatic gain profile control and calibration Jun. 12, 2012
8183917 RF power amplifier circuit with mismatch tolerance May. 22, 2012
8169260 Amplifier circuit utilizing characteristic correction and smooth curvilinear correction May. 1, 2012
8149966 Packet acquisition controller with signal strength threshold control for wireless MIMO receiver Apr. 3, 2012
8121561 Power tuning system and method for power amplifier Feb. 21, 2012
8102208 Signal amplifier Jan. 24, 2012
8093945 Joint optimisation of supply and bias modulation Jan. 10, 2012
8093947 Power amplifier Jan. 10, 2012
8093948 Power amplifier Jan. 10, 2012
8093946 Joint optimisation of supply and bias modulation Jan. 10, 2012
8085089 Method and system for polar modulation with discontinuous phase for RF transmitters with integrated amplitude shaping Dec. 27, 2011

1 2 3 4 5 6 7 8 9 10 11 12

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