Matches 251 - 300 out of 385 < 1 2 3 4 5 6 7 8 >
Match Document Document Title
6373335 Integrated audio amplifier  
An audio amplifier comprising a power amplifier section, a power supply, and a control circuit. The power supply is made up of a positive and negative power supply section, with the positive supply...
6373336 Method of attenuating zero crossing distortion and noise in an amplifier, an amplifier and uses of the method and the amplifier  
According to the invention, a method and an amplifier e.g. of the class D type, in particular connected as class BD, wherein an audio signal is pulse-with modulated in that two sets of switches are...
6362683 Break-before-make distortion compensation for a digital amplifier  
Methods and apparatus are described for reducing or eliminating break-before-make distortion in switching amplifiers. A switching amplifier has an input stage for generating a switching signal....
6348836 Dual independently clocked analog-to-digital conversion for a digital power amplifier  
An electronic device is described which includes at least two sampling circuits, and at least two switching stages configured in parallel. Each of the switching stages is coupled to one of the...
6346852 Class-D amplifier with enhanced bandwidth  
A class D amplifier includes an input integrating stage and a modulating stage for modulating the integrated input signal output by the integrating stage. The modulating stage uses as a carrier an...
6342809 Closed loop circuit switch mode power amplifier  
A switch mode power amplifier circuit apparatus comprises a fixed gain amplifier, modulator and a filter circuit electrically configured so as to direct a feedback signal for reducing clock ripple...
6339360 Digital amplifier with pulse insertion circuit  
A digital amplifier having an input for receiving an input signal employs an oscillator for producing a reference pulse signal and a sawtooth signal. A first generating circuit coupled to the...
6331801 RF amplifier system having an improved power supply  
An RF power amplifier system is provided having a DC voltage source for providing an input DC voltage. An RF source provides an RF cattier signal. An RF amplifier serves to amplifier the carrier...
6320465 Constant duty-cycle limiting of analog input signal swing in a class-D amplifier  
A constant limit duty-cycle is established by detecting the equivalent values VDD' and -VDD" of the voltages to which the output signal of the amplifier switches or pseudo supplies. An input...
6320460 Class D amplifier  
A Class D amplifier having a low-level audio signal feeding the negative input of an Integrator via an input resistor. Said Integrator feeds a Comparator having well-defined Hysterisis. Said...
6316992 DC offset calibration for a digital switching amplifier  
An offset voltage calibration circuit for use with a digital switching amplifier. The calibration circuit includes an analog-to-digital converter for converting at least one DC offset voltage...
6313697 Device for amplifying signals  
The device for amplifying input signals (10) comprises a control stage (12) and a switching bridge amplifier (14), which is coupled to said control stage via at least first and second control...
6304137 Output stage for high power class D amplifiers  
An output stage for a class D amplifier reduces distortion and EMI, and greatly improves the efficiency. The output stage employs a combination of techniques including a soft switching network,...
6300825 PWM amplifier with feedback loop integrator  
A PWM amplifier comprising a comparator and an integrator is known to amplify, for example, audio signals. One drawback of the known PWM amplifiers is the maximally achievable loop gain is low. To...
6300830 Multiplexed input envelope restoration scheme for linear high-efficiency power amplification  
A circuit for providing a multiplexed input to an amplifier load matching network. The circuit includes a control device receiving amplitude information and phase information from a primary...
6297692 Pulse modulation power amplifier with enhanced cascade control method  
A digital switching power amplifier with Multivariable Enhanced Cascade Controlled (MECC) includes a modulator, a switching power stage and a low pass filter. In the first preferred embodiment an...
6297697 Methods and apparatus for noise shaping a mixed signal power output  
A signal processing circuit and method for processing an input signal are described. The circuit includes a frequency selective network, an amplification stage, and at least one continuous-time...
6294954 Adaptive dead time control for switching circuits  
Apparatus for adaptively reducing dead time in a switching circuit includes overlap detection circuitry for measuring the dead time/overlap of the switches, and control circuitry for setting the...
6294957 RF power amplifier having synchronous RF drive  
A RF power amplifier system is presented herein including a RF source for providing a train of RF pulses exhibiting RF cycles of a fixed frequency and wherein each pulse is of a fixed amplitude and...
6281767 Reconstruction filter for eliminating the switching residue in a switched system  
The filter for eliminating a carrier signal from a modulating signal generated by a circuit supplying a load (Z) comprises a filtering circuit (L, C; L', C') and a cancellation network (Lx, Cx, V 2...
6262632 Concept and method to enable filterless, efficient operation of Class-D amplifiers  
A Class-D switching amplifier (30, 40) having a ternary mode of operation. Signal processing (21, 22) is provided to eliminate the potential of crosstalk within one channel by introducing a time...
6259317 Output stage utilizing a floating power supply  
A switching output stage for Class D amplifiers and the like utilizes a floating power supply providing a relative positive output voltage VP at a first line and a relative negative output voltage...
6255907 Power amplifier  
A power amplifier designed for delivering high power to a load (LOAD) comprises an input stage (A1) that converts an input voltage (u 1 ) to a current signal (i in ) which is applied to an end...
6249182 Class D amplifier with bandwidth independent of load impedance  
A high Q low pass filter removes the carrier from a Class D amplifier. Speaker impedance varies with frequency, and it is desirable for to drive 2, 4 and 8 ohm speakers. The bandwidth feedback...
6232833 Low noise low distortion class D amplifier  
The low jitter dead time circuit which uses one RC combination to set the turn on delay for both the upper and lower MOSFETs in the half bridge. This circuit minimized jitters in the turn on delay...
6229392 High power switch-mode radio frequency amplifier method and apparatus  
Disclosed are both methods and a circuit to achieve powers of many kilowatts in radio frequency amplification using a switch mode amplifier in a new class of operation. In operation the invention...
6229393 High frequency power generator  
A high frequency power generator comprises a power amplifier working in switching operation, an output filter, having at least one series resonant circuit and at least one parallel resonant...
6215356 Power amplifier arrangement  
An amplifier arrangement includes a class-G amplifier, biased by a first and a second pair of bias voltages, a drive control circuit and a second amplifier (C) biased by the second pair of supply...
6191650 Class d amplifier with pulse width modulation and a very low power consumption  
The invention concerns a class D amplifier in which a high-frequency reference signal is pulse width modulated by an input signal, such as an audio signal, and in which there are generated a pair...
6166602 High-efficiency switching power amplifier  
A plurality of low-voltage, series-connected input dc-dc converters provide the input to a low-frequency, high-voltage dc-ac output bridge converter suitable for driving a gradient coil in an MRI...
6163214 Analog signal amplifier  
A low cost analog signal amplifying circuit suitable for manufacturing in the form of an integrated circuit having an external load, two DAC, two signal control elements and two switching circuit...
6150880 Method and device for generating drive signals for a power output stage, and a power output stage  
In a method for generating respective drive signals for four switch elements of a power output stage, a start signal and a stop signal are generated depending on an on-duration value first and...
6140873 Power amplifier with soft switching and multilevel switching cells  
A power amplifier for delivering large currents as well as high voltages of the order of some hundreds of amperes and 1000 or more volts, notably for MRI. The amplifier is constructed as a...
6127885 Class D amplifiers including transition zone modulation  
Class D amplifiers and methods dynamically modulate the transition zone of a square wave as a function of the input signal. Stated differently, the slew rate of the square wave is dynamically...
6118337 Method for the generation of control signals for a power amplifier and power amplifier  
In a flexible and uncomplicated method for generating control signals for a power amplifier, and in a power amplifier having at least two output stages connected in series at the output side, which...
6118336 Start-up circuit for self oscillating class D modulator  
A class D modulator 100 is self oscillating. It includes an input stage 110, an operational amplifier 120, an integrator 130 and a pulse width modulator 140. A start-up generator 22 generates...
6078217 Electromagnetic, compatible clocked amplifier for a.c./d.c. current amplification  
An electromagnetic, compatible, clocked amplifier for d.c./a.c., current amplification including, for a single phase, a transistor power amplifier having at least one first switching transistor and...
6078214 High efficiency class DB power amplifier  
A method and circuitry for amplifying an input signal. First, second and third input signals are provided with the third input signal being the average of the first and second input signals. A ramp...
6064259 High power, high performance pulse width modulation amplifier  
A high performance pulse width modulation amplifier system employing an H-bridge amplifier connected to a carrier wave output filter produces a pulsed wave signal with high power transfer...
6049248 Method and apparatus for generating a driver signal for use by a non-linear class S amplifier for producing linear amplification  
A circuit for receiving an input signal having a phase component and an amplitude component which carry information, and for producing an output driver signal containing the phase and amplitude...
6046636 Device for amplifying signals  
A device for amplifying signals comprising at least two amplifier circuits (20, 30, 40, 50) as well as means for precluding interference between the amplifier circuits (20, 30, 40, 50). The...
6028943 Audio amplifier system using a class D amplifier  
Class D amplifiers are difficult to incorporate into audio amplifier systems because of the interference created by the amplifier and/or the surrounding circuits. The modulation frequencies f1 and...
5986498 Audio direct from power supply  
A novel circuit that generates direct audio from a power supply that uses no power amplifier and that can provide full isolation to any impedance load. It has no power amplifier output stage and...
5973556 Delta-modulated power supply  
A delta-modulated magnitude amplifier is used to amplify the magnitude component of an RF power amplifier that employs envelope elimination and restoration. The delta-modulated amplifier introduces...
5974089 Method and apparatus for performance improvement by qualifying pulses in an oversampled noise-shaping signal processor  
The transition time of power switching devices ultimately limits the rate at which such devices can be switched. Because the occurrence of unacceptably narrow pulses is relatively rare in an...
5963086 Class D amplifier with switching control  
A class D amplifier utilizing first and second switches connected in series to conduct current from a power source in a sequential manner. The switches have a common output node between them. A...
5949282 Class D amplifier no low pass filter feedback with zero phase delay  
A circuit for generating an accurate reproduction of the output of a Class D amplifier for error-correction purposes includes a reference signal amplifier circuit. The reference signal amplifier...
5933040 Method and apparatus for a data detection circuit operating from a low voltage power source  
A method and apparatus for detecting pulse data is accomplished by a low voltage data detection circuit that includes a preamplifier circuit, an amplification stage, and a scaling circuit. The...
5917369 Pulse width modulator with automatic gain control over-voltage modulator and limiter  
A pulse-width modulation (PWM) circuit in a Class D audio amplifier includes output-limiting logic and an automatic gain control (AGC) circuit. When an out-of-range, or overmodulated, input signal...
5905407 High efficiency power amplifier using combined linear and switching techniques with novel feedback system  
An amplifier (100) includes an output node (114) having an output voltage (V out ), and a switching amplifier (104) having a first output (132) coupled to the output node for delivering a switching...
Matches 251 - 300 out of 385 < 1 2 3 4 5 6 7 8 >