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Class Information
Number: 330/75
Name: Amplifiers > Signal feedback
Description: Subject matter wherein signal feedback circuit means are provided to superimpose a portion of the electrical signal output energy on the amplifier input signal.










Sub-classes under this class:

Class Number Class Name Patents
330/85 Amplifier in signal feedback path 306
330/81 At least one push-pull signal stage 7
330/87 Cathode impedance feedback 2
330/96 Combined with control of bias voltage of signal amplifier 21
330/76 Compensating for inter-electrode impedance (e.g., neutralization) 12
330/102 Current and voltage feedback 33
330/109 Frequency responsive feedback means 284
330/105 From impedance in series with output load (e.g., current feedback) 34
330/98 In cascade amplifiers 132
330/106 In series with input source 4
330/97 Including d.c. path for signal feedback 12
330/103 Multiple feedback paths 74
330/110 Nonlinear impedance element in loop path 194
330/107 Phase shift means in loop path 445
330/84 Plural amplifier channels 155
330/101 Positive and negative feedback in same path at different frequencies 9
330/112 Positive feedback 31
330/108 Potentiometer common to signal and feedback path 32
330/111 To or from an auxiliary grid or to the anode 0
330/86 Variable impedance in feedback path varied by separate control path 337


Patents under this class:

Patent Number Title Of Patent Date Issued
8620233 Method of power amplifier predistortion adaptation using compression detection Dec. 31, 2013
8095088 Compact wide dynamic range transmitter for point to point radio Jan. 10, 2012
8023588 Adaptive predistortion of non-linear amplifiers with burst data Sep. 20, 2011
7932778 Power efficient amplifier Apr. 26, 2011
7915995 Compensation of field effect on polycrystalline resistors Mar. 29, 2011
7907904 Mitigating interference to nearby radio systems based on characterization of adjacent channels Mar. 15, 2011
7787634 Musical distortion circuits Aug. 31, 2010
7761059 Method of transmitting or receiving with constrained feedback information Jul. 20, 2010
7737776 Power efficient amplifier Jun. 15, 2010
7616089 Compensation of field effect on polycrystalline resistors Nov. 10, 2009
7589586 High frequency signal detection circuit Sep. 15, 2009
7518454 Operational amplifier selecting one of inputs, and an amplifying apparatus using the OP amplifier the verification method Apr. 14, 2009
7492219 Power efficient amplifier Feb. 17, 2009
7484139 Amplifier fault detection circuit Jan. 27, 2009
7423480 AC amplifier for precision measurement Sep. 9, 2008
7395038 High-efficiency modulating RF amplifier Jul. 1, 2008
7339436 Ultra broad-band low noise amplifier utilizing dual feedback technique Mar. 4, 2008
7221226 Amplifying apparatus with automatic level controller May. 22, 2007
7164893 Method and apparatus for optimizing supply modulation in a transmitter Jan. 16, 2007
7161419 Sensor device and a signal amplification device of a small detection signal provided by the sensor Jan. 9, 2007
7113037 Performing remote power amplifier linearization Sep. 26, 2006
7099635 High-efficiency modulating RF amplifier Aug. 29, 2006
7068098 Slew rate enhancement circuit Jun. 27, 2006
6985033 Circuits and methods for adjusting power amplifier predistortion, and power amplifiers and other devices including the same Jan. 10, 2006
6930548 Method and system for improving amplifier efficiency Aug. 16, 2005
6879216 Integrated circuit that provides access to an output node of a filter having an adjustable bandwidth Apr. 12, 2005
6847807 Transmission circuit and radio transmission apparatus Jan. 25, 2005
6833757 Method and system for improving amplifier efficiency Dec. 21, 2004
6766153 Dynamic automatic gain control circuit employing kalman filtering Jul. 20, 2004
6647073 Linearisation and modulation device Nov. 11, 2003
6566947 Combined active impedance and filter in line drivers May. 20, 2003
6407631 Charge-type sensor amplifying circuit Jun. 18, 2002
6023363 Optical transmission apparatus Feb. 8, 2000
6005316 Current mode switching for tri-state amplifiers in magnetic bearing control systems Dec. 21, 1999
5977824 Circuit feedback loop with monitored loop gain Nov. 2, 1999
5515001 Current-measuring operational amplifier circuits May. 7, 1996
5347529 Method for generating a distortion-free, frequency-modulated optical signal and apparatus for the implementation of such a method Sep. 13, 1994
5327095 Method and circuit for increasing the output impedance of an inactive amplifier Jul. 5, 1994
4644138 Temperature control system with simplified controller and power supply Feb. 17, 1987
4618814 Voltage-to-current converter circuit Oct. 21, 1986
4580104 High voltage operational amplifier Apr. 1, 1986
4409556 Amplifier arrangement with very low distortion Oct. 11, 1983
4383222 Half-wave signal isolator with compensator means to reduce temperature-dependent effects May. 10, 1983
4360784 Transformer coupled isolation amplifier Nov. 23, 1982
4191929 Isolation amplifier with high linearity Mar. 4, 1980
4065726 Negative feedback amplifier and lever shifter Dec. 27, 1977
4059807 Pulse width modulated amplifier Nov. 22, 1977
4021745 Pulse width modulated signal amplifier May. 3, 1977
4004246 Pulse width modulated signal amplifier Jan. 18, 1977











 
 
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