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US20110316627 DYNAMIC CONSTANT POWER AMPLIFIER  
A switching amplifier including a voltage sensor circuit connected to a high voltage supply rail for measuring the power supply voltage. A current sensor circuit is connected to the high voltage...
US20110148521 DYNAMIC CONSTANT POWER AMPLIFIER  
A switching amplifier including a voltage sensor circuit connected to a high voltage supply rail for measuring the power supply voltage. A current sensor circuit is connected to the high voltage...
US20140052126 ELECTROSURGICAL DEVICES AND METHODS  
An electrosurgical system may generally first and second electrodes coupled to an energy source operative to generate and deliver pulses of a biphasic radio frequency (RF) waveform to treat...
US20110110538 POWER AMPLIFIER AND METHOD FOR RESTRAINING POWER OF IMPROVED POWER AMPLIFIER  
The present invention is related to an improved power amplifier and a method for restraining power of the improved power amplifier. The improved power amplifier has an output power restraint unit,...
US20130108081 AMPLIFIER  
[Problem] The purpose is to provide an amplifier capable of reducing the quantization error caused by conversion accuracy in an A/D converter circuit and, particularly, capable of improving the S/N...
US20140159811 SUPER-EFFICIENT SINGLE-STAGE ISOLATED SWITCHING POWER AMPLIFIER  
A super-efficient single-stage switching power amplifier is realized by not incorporating a rectification process in its power conversion loop while incorporating a bidirectional active clamping...
US20140300413 POWER TRANSISTOR GATE DRIVER  
The present invention relates to a gate driver for a power transistor comprising a first charging path operatively connected between a first voltage supply and a gate terminal of the power...
US20110210790 FILTER COMPENSATION FOR SWITCHING AMPLIFIERS  
Embodiments of the present invention provide methods and systems for limiting bipolar current flow in a switching amplifier. Embodiments of the present invention are directed to a multi-referenced...
US20110248781 Duplicate feedback network in class D amplifiers  
A circuit and a method are provided for suppressing the pop and click noise during the power on and power off of Class D amplifiers. The technique also suppresses pops and clicks when the Class D...
US20130335143 CLASS-D POWER AMPLIFIER CAPABLE OF REDUCING ELECTROMAGNETIC INTERFERENCE AND TRIANGULAR WAVE GENERATOR THEREOF  
A class-D power amplifier capable of reducing electromagnetic interference includes an integrator, a triangular wave generator, a comparator, a gate driver, a feedback circuit, and an output stage...
US20110051842 EFFICIENT LINEAR LINC POWER AMPLIFIER  
Method for setup of parameter values in a RF power amplifier circuit arrangement (200), wherein the amplifier circuit arrangement (200) comprises a first (210) and a second (220) amplification...
US20140203871 ZERO-VOLTAGE-SWITCHING CONTOUR BASED OUTPHASING POWER AMPLIFIER  
A zero-voltage-switching contour based outphasing power amplifier having two class-E power amplifiers connected in an out-phasing architecture coupled on opposite sides of a load being driven. The...
US20140203772 WIRELESS ELECTRIC POWER TRANSMITTER  
A wireless electric power transmitter for transmitting electric power for a charging function to a wireless electric power receiver is provided. The wireless electric power transmitter includes an...
US20130285744 Overcurrent Protection for Class D Power Amplifier  
In an aspect of the disclosure, a class D power amplifier with an overcurrent protection (OCP) circuit is provided. The class D power amplifier includes a plurality of output transistors, and the...
US20130293298 Split Capacitors Scheme for Suppressing Overshoot Voltage Glitches in Class D Amplifier Output Stage  
A class D power amplifier is provided. The class D power amplifier includes a class D driver circuit having a plurality of output transistors, at least one active clamp circuit coupled to at least...
US20140334647 Dual Bridge Amplifier Configuration  
An amplifier has a dual bridge design with two bridge amplifiers. A mode switch enables them to be configured in a series amplification mode. The switching of the mode switch is dynamic and enables...
US20140097895 PSEUDO-ENVELOPE FOLLOWING FEEDBACK DELAY COMPENSATION  
A switch mode power supply converter and a feedback delay compensation circuit are disclosed. The switch mode power supply converter has a switching voltage output and provides a switching voltage...
US20110109386 CLASS D AMPLIFIER CAPABLE OF SETTING RESTRAINT POWER  
A Class D amplifier capable of setting restraint power is provided, which comprises: an audio amplification unit, a pulse width modulation (PWM) unit, a first pre-drive unit, a second pre-drive...
US20110237206 SWITCHED POWER AMPLIFIER TOPOLOGY PROVIDING HIGH EFFICIENCY  
A switched power amplifier contained in a circuit is implemented to receive a single-ended input signal and generate a single-ended output signal, the single-ended output signal being a...
US20140062593 CLASS RESONANT-H ELECTROSURGICAL GENERATORS  
A generator for use with an electrosurgical device is provided. The generator has a gain stage electrically disposed between a first voltage rail and a second voltage rail, wherein the gain stage...
US20120242284 FILTER FOR IMPROVED DRIVER CIRCUIT EFFICIENCY AND METHOD OF OPERATION  
This disclosure provides systems, methods and apparatus for increasing the efficiency of an amplifier when driven by a variable load. In one aspect a transmitter device is provided. The transmitter...
US20130127530 MULTI-LEVEL BOOSTED CLASS D AMPLIFIER  
Techniques to generate boosted multi-level switched output voltages from a boosted multi-level Class D amplifier. The amplifier may include a multi-level H-bridge, which may include pairs of...
US20120326783 LOW-VOLTAGE POWER-EFFICIENT ENVELOPE TRACKER  
Techniques for efficiently generating a power supply are described. In one design, an apparatus includes an envelope amplifier and a boost converter. The boost converter generates a boosted supply...
US20110025415 Digital Modulated RF Power Amplifier with Impedance Compensation Circuit  
A digital modulated power amplifier unit includes a differential radio frequency (RF) amplifier circuit having differential output nodes, a digital modulation signal input and complimentary clock...
US20140191801 BICMOS GATE DRIVER FOR CLASS-S RADIO FREQUENCY POWER AMPLIFIER  
The invention may be embodied in a resynchronizing, push-pull drive circuit for driving the gate electrodes of a digital Class-S Radio Frequency Power Amplifier (RF-PA). A binary bitstream received...
US20120182081 Dynamic Range Compression Circuit and Class D Amplifier  
A dynamic range compression circuit includes an attenuator that attenuates a signal at a predetermined node in an amplifier to reduce a gain of the amplifier and a gain controller that reduces the...
US20120242407 Switched Amplifier Circuit Arrangement and Method for Switched Amplification  
A switched amplifier circuit arrangement comprises a main amplifier (Amp) having an input terminal (In) and an output terminal (Out) and a regulating amplifier (rAmp) to set an input and an output...
US20120229211 AMPLIFIER USING FAST DISCHARGING REFERENCE  
Techniques are disclosed relating to charging and discharging a gate of transistor. In one embodiment, an apparatus is disclosed that includes a driver configured to discharge a gate of a...
US20120293256 SWITCHING AMPLIFIER  
When a switching amplifier transitions into a power-off state, a switch is turned off and a power supply controller forcibly discharges a capacitor and forcibly reduces a reference potential with...
US20140028393 CIRCUITS FOR PROVIDING CLASS-E POWER AMPLIFIERS  
In some embodiments, circuits for providing Class-E power amplifiers are provided, the circuits comprising: a first switch having a first side and a second side; a first Class-E load network...
US20120056670 CROSS CURRENT MINIMIZATION  
A method of optimising cross current in class D amplifiers and simultaneously minimizing the harmonic distortion is provided. The method overcomes the problem of using the limited speed voltage...
US20140070885 POWER SUPPLY ARRANGEMENT FOR SINGLE ENDED CLASS D AMPLIFIER  
A power supply arrangement for a single ended class D amplifier, including a first primary winding connected in series with a first switch between the positive supply rail and ground, a second...
US20110286611 DIGITAL AMPLIFIER  
A digital amplifier is described with decreased high-frequency noise current flowing into GND via a capacitor in a low-pass filter output. Consequently output sound quality is improved because AC...
US20140197886 AMPLIFIER WITH SWITCHABLE COMMON GATE GAIN BUFFER  
An amplifier having a switchable common gate gain buffer is disclosed. In an exemplary embodiment, an apparatus includes a plurality of selectable gain channels that provide constant input...
US20110254625 CIRCUIT AND METHOD FOR REDUCING NOISE IN CLASS D AMPLIFIERS  
A circuit for reducing noise in Class D amplifiers has a power stage voltage control means (17, 21, 22) responsive to defined signal conditions of the audio signal input (1). The power stage...
US20130049862 SWITCHING CIRCUIT AND ENVELOPE SIGNAL AMPLIFIER  
A switching circuit according to one embodiment has: N switching elements; a connection circuit including N−1 first inductance elements that are connected in series; a second inductance element; a...
US20130308893 INTEGRATED DRIVER AND RELATED METHOD  
A driver circuit may include a first node (VA), and a first circuit to generate on the first node (VA) an inverted replica of an input signal (VIN) during driver switching between a first supply...
US20130222062 EFFICIENCY IMPROVED ENVELOPE AMPLIFIER USING DUAL SWITCHING AMPLIFIERS  
Provided is a hybrid envelope amplifier having improved efficiency, and more particularly, to an envelope amplifier using a dual switching amplifier and having improved efficiency in which power...
US20140184328 CASCODE BIAS OF POWER MOS TRANSISTORS  
There is disclosed a driver circuit for a power amplifier of class D type having a segmented architecture with at least one current branch which can be powered down in a low power mode of operation...
US20100327973 AMPLIFIER CIRCUIT COMPRISING CHARGE PUMP AND LOW-PASS FILTER  
According to one embodiment, an amplifier circuit includes a clock generation circuit, a switching amplifier circuit, and a smoothing circuit. The clock generation circuit generates a pseudo random...
US20130285745 POP-NOISE REDUCTION  
A method of adjusting the frequency or phase of operation of a Class-D amplifier is disclosed. The method comprises making a series of step changes in the frequency or phase to adjust the frequency...
US20120286868 CLASS D POWER AMPLIFIER  
A class D power amplifier (PA) is provided. The PA generally comprises a driver, output capacitor, a matching network, and a cancellation circuit. The driver has an input, an output, and a...
US20140333379 BROADBAND POWER AMPLIFIER HAVING HIGH EFFICIENCY  
A wideband power amplifier module includes a plurality of switch mode amplifiers and a plurality of impedance amplifier modules. Each switch mode amplifier includes an input to receive an input...
US20120025910 Switching amplifier with enhanced supply rejection and related method  
Disclosed is a switching amplifier having an enhanced supply rejection. The switching amplifier comprises a digital modulator that provides a modulated signal. The switching amplifier further...
US20140203870 POWER MOSFETS WITH IMPROVED EFFICIENCY FOR MULTI-CHANNEL CLASS D AUDIO AMPLIFIERS AND PACKAGING THEREFOR  
A stereo class-D audio system includes a first die including four monolithically integrated NMOS high-side devices and a second a second die including, four monolithically integrated PMOS low-side...
US20130200952 POWER MOSFETS WITH IMPROVED EFFICIENCY FOR MULTI-CHANNEL CLASS D AUDIO AMPLIFIERS AND PACKAGING THEREFOR  
A stereo class-D audio system includes a first die including four monolithically integrated NMOS high-side devices and a second a second die including four monolithically integrated PMOS low-side...
US20130033318 SWITCHING AMPLIFIER AND AUDIO DEVICE  
A switching amplifier is provided. The switching amplifier includes an input unit which receives an audio signal; a first switching device and a second switching device which switch and output the...
US20140312968 DIFFERENTIAL OUTPUT INDUCTOR FOR CLASS D AMPLIFIER  
A circuit includes a first input terminal for receiving a first pulsed voltage and a second input terminal for receiving a second pulsed voltage. The circuit further includes a load and an LC...
US20100188150 Switching Amplifier  
A switching amplifier is disclosed and comprises: a power supply (Vcc); input circuits (Va, Vb); switch transistors (M1, M2) connected with each other in series; driving circuits (I1, I2) coupled...
US20120039487 FIRST STAGE AMPLIFIER CIRCUIT  
An external audio signal is input to an input terminal which is connected to the first terminal of a first resistor. The first terminal of a second resistor is connected to the second terminal of...
Matches 1 - 50 out of 250 1 2 3 4 5 >