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Class Information
Number: 330/10
Name: Amplifiers > Modulator-demodulator-type amplifier
Description: Subject matter including means for modulating the signal, which is usually D.C. or low frequency A.C. amplifying means, and means to restore the original signal, eliminating any carrier frequency components.










Patents under this class:

Patent Number Title Of Patent Date Issued
8710922 Method and apparatus for filter-less class D audio amplifier EMI reduction Apr. 29, 2014
8705773 Audio amplifier Apr. 22, 2014
8705771 Line-in signal dynamic range enhancement for output of charge pump based audio amplifier Apr. 22, 2014
8705767 Electrostatic speaker system Apr. 22, 2014
8704599 Switching power supply circuit Apr. 22, 2014
8686789 Transient signal suppression for a class-D audio amplifier arrangement Apr. 1, 2014
8680916 High efficiency variable voltage supply Mar. 25, 2014
8675725 Integrated circuit, communication unit and method for improved amplitude resolution of an RF-DAC Mar. 18, 2014
8669809 Differential output inductor for class D amplifier Mar. 11, 2014
8665018 Integrated circuit, wireless communication unit and method for a differential interface for an envelope tracking signal Mar. 4, 2014
8660502 High frequency antenna switch module Feb. 25, 2014
8660277 Amplifier circuit and methods of operation thereof Feb. 25, 2014
8660276 Driving circuit for a sound outputting apparatus Feb. 25, 2014
8659354 Power-amplifier arrangement Feb. 25, 2014
8659351 Electronic circuit for driving a switching amplifier Feb. 25, 2014
8655292 Amplifier circuit, transmitter, and method of controlling amplifier circuit Feb. 18, 2014
8649528 Microphone unit with internal A/D converter Feb. 11, 2014
8648655 Modulator and an amplifier using the same Feb. 11, 2014
8645884 Multi-layer memory structure for behavioral modeling in a pre-distorter Feb. 4, 2014
8639193 Tri-state control for a line driver Jan. 28, 2014
8633768 Amplifying device Jan. 21, 2014
8633763 Output circuits with class D amplifier Jan. 21, 2014
8624706 Control circuit for indicator light Jan. 7, 2014
8618875 Using a new synchronization scheme for a multi-channel class-D amplifier Dec. 31, 2013
8598950 Apparatus and methods for capacitive load reduction Dec. 3, 2013
8594346 Audio output drivers for piezo speakers Nov. 26, 2013
8588712 Modulation method and apparatus Nov. 19, 2013
8588330 Quadrature communications device with I antennas and Q antennas and related methods Nov. 19, 2013
8576003 Cascaded class D amplifier with improved linearity Nov. 5, 2013
8571237 Multi-zone audio amplification system for multimedia Oct. 29, 2013
8570102 Switching amplifier Oct. 29, 2013
8570101 Variable duty cycle generation for out-phasing and PWM power amplifiers Oct. 29, 2013
8558610 Integrator input error correction circuit and circuit method Oct. 15, 2013
8558609 Amplification systems and methods with noise reductions Oct. 15, 2013
RE44525 Systems and methods for over-current protection Oct. 8, 2013
8553909 Low-power class D amplifier using multistate analog feedback loops Oct. 8, 2013
8553802 Quadrature communications device with I antennas and Q antennas and modulated power supply and related methods Oct. 8, 2013
8536938 Output circuits with class D amplifier Sep. 17, 2013
8526640 Apparatus and method for switching audio amplification Sep. 3, 2013
8525587 Switching amplifier with inductance means for transmitting energy Sep. 3, 2013
8521104 Amplifier structure and amplification method thereof Aug. 27, 2013
8519791 Free-fly class D power amplifier Aug. 27, 2013
8514117 Excess loop delay compensation for a continuous time sigma delta modulator Aug. 20, 2013
8509290 Closed-loop digital power control for a wireless transmitter Aug. 13, 2013
8502602 Class-D amplifier circuit Aug. 6, 2013
8502600 Combiner-less multiple input single output (MISO) amplification with blended control Aug. 6, 2013
8497734 High efficiency audio amplifier system Jul. 30, 2013
8494180 Systems and methods to reduce idle channel current and noise floor in a PWM amplifier Jul. 23, 2013
8489046 Signal decomposition methods and apparatus for multi-mode transmitters Jul. 16, 2013
8489035 Radio communication transceiver Jul. 16, 2013











 
 
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