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| Number | Title | Issue Date |
| 7679435 | Digital input class-D amplifier A digital input class-D amplifier includes a decoder which outputs a plurality of lines of time-series digital signals having a density of 1 or 0 conforming to an input digital signal, an error integrator which integrates a difference between a drive waveform to be ... | 03/16/2010 |
| 7679434 | Amplifier modulation method and apparatus One embodiment relates to a power amplifier that includes a switched mode power amplification stage. The power amplification stage has an output configured to provide an amplified output voltage as a function of a drive signal, where the drive signal fluctuates duri... | 03/16/2010 |
| 7679433 | Circuit and method for RF power amplifier power regulation and modulation envelope tracking A power amplifier receives an input signal and generates an amplified output signal. A switching converter generates a regulated voltage and performs power control for the power amplifier. A linear amplifier performs modulation envelope control for the power amplifi... | 03/16/2010 |
| 7671673 | Class-D amplifier A PWM modulator adds first and second input signals to each other, and performs PWM modulation processing for outputting a PWM-modulated pulse whose pulse width is modulated according to a result of addition. A shift register delays a bit stream acquired from a ΔΣ... | 03/02/2010 |
| 7667537 | Method for correcting a harmonic distortion of a power bridge, in particular for a class D amplifier To correct for harmonic distortion of a power bridge, the form of a pulse at the output of the power bridge and of estimate of non idealities under different current conditions is acquired. An estimate of a current at the output of the power bridge is also acquired.... | 02/23/2010 |
| 7659778 | Apparatus and method for class D amplifier with sampling rate conversion A class D amplifier is provided. The class D amplifier includes an interpolator, a sampling rate converter, a pulse width modulator, a sigma-delta modulator, and a pulse width modulation (PWM) pulse generator (PPG). The sampling rate converter interpolates the outpu... | 02/09/2010 |
| 7649410 | Systems and methods for improving performance in a digital amplifier by adding an ultrasonic signal to an input audio signal Systems and methods in which an ultrasonic signal is introduced into an audio signal before the audio signal is amplified by a switching amplifier. The added ultrasonic signal (e.g., a tone at half the amplifier's switching frequency) shifts the signals input to a s... | 01/19/2010 |
| 7642847 | Power supply processing for power amplifiers The present invention, generally speaking, uses multiple selectable power supply paths, a saturation detector, or combinations of the same to achieve efficient power supply processing. In one aspect of the invention, a power supply processing circuit includes a firs... | 01/05/2010 |
| 7633336 | Audio amplifier and methods of generating audio signals Audio amplifiers and methods of generating audio signals are disclosed. A disclosed example amplifier comprises a first driver to receive a first signal; a second driver to receive a second signal; a configurable signal delivery circuit; and a mode selector in commu... | 12/15/2009 |
| 7629841 | Sigma-delta modulator with feedback for power amplifiers The invention concerns an electronic circuit comprising a sigma-delta modulator and a power amplifier connected downstream thereof, wherein there is provided a feedback circuit (207) which is coupled between an output of the sigma-delta modulator and an input... | 12/08/2009 |
| 7629840 | Digital pulse width modulated feedback system for a switching amplifier and method therefor A switching amplifier includes a power stage, a low pass filter, a combining circuit, and a feedback correction circuit. The power stage has an input terminal and an output terminal. The low pass filter has an input terminal coupled to the output terminal of the pow... | 12/08/2009 |
| 7629842 | Class D audio amplifier A class D audio amplifier includes an error amplifier, a comparator, a bridge circuit, a feedback circuit and a silent start circuit. The error amplifier generates an error signal by amplifying a difference between a feedback signal and an audio input signal. The co... | 12/08/2009 |
| 7619467 | Modulated triangular wave amplifier The invention is a power amplifier circuit for providing a signal acceptable for use in audio amplifiers or similar applications without requiring a stable power supply free from fluctuations. An alternating current power supply signal rectified to a direct current ... | 11/17/2009 |
| 7616053 | Power amplifier circuit and method for envelope modulation of high frequency signal A power amplifier circuit includes: a transformer receiving a first signal and generating a transformed signal from the first signal; and a transistor receiving a second signal having a direct current (DC) component, and generating an output signal. The second signa... | 11/10/2009 |
| 7609110 | Filterless class-D speaker driver with less switching Methods for designing a filterless class-D amplifier and driver are described herein. In the exemplary embodiment, a feedback loop is used to stabilize the filterless class-D amplifier. A pulse width modulated (PWM) output signal is generated by adding a comparator ... | 10/27/2009 |
| 7586369 | Pulse modulation type electric power amplifier A pulse modulation type electric power amplifier includes a pulse modulator that receives as input a clock and an input signal, and converts the input signal to a pulse train, an output control circuit that receives as input the pulse train output by the pulse modul... | 09/08/2009 |
| 7583138 | System and method for controlling an error amplifier between control mode changes A system and a method are disclosed for controlling an error amplifier between control mode changes. An error amplifier comprises a first stage that comprises a first current source and a second stage that comprises a second current source and at least one compensat... | 09/01/2009 |
| 7583137 | Power supply compensation The invention relates to an amplifier comprising amplification means (AM) comprising an input and an output, said amplification means (AM) comprising a switching output stage delivering at least one output signal (OUS) via said output, said... | 09/01/2009 |
| 7579907 | Switching amplifier A switching amplifier of the invention boasts of an enhanced SN ratio in its output and an increased amplitude limit value in its input signal. The switching amplifier has a quantized signal generating section that converts an input signal to generate a quantized si... | 08/25/2009 |
| 7579908 | Digital audio amplifiers, electronic systems, and methods An embodiment of an electronic system includes a digital audio amplifier having a continuous time modulator adapted to generate a difference signal between an audio bitstream and a feedback signal, and to perform a modulation process on the difference signal to gene... | 08/25/2009 |
| 7576604 | All-digital class-D audio amplifier An all-digital class-D audio amplifier and method of digitizing an analog signal comprises a pulse-width modulation (PWM) wave generator for generating a PWM wave; an interpolator for receiving an input audio signal, up-sample the input audio signal; and down-sample... | 08/18/2009 |
| 7576606 | Digital PWM amplifier having a low delay corrector Systems and methods for performance improvements in digital switching amplifiers using a low delay corrector. In one embodiment, a digital pulse width modulation (PWM) amplifier includes a signal processing plant configured to receive and process an input audio sign... | 08/18/2009 |
| 7576605 | Low power output stage Power consumption of an output stage such as a class-D output stage may depend on the amplitude and the activity of the signal being output. Here, control signals may be generated to independently control coupled switches of the output stage and to provide a tri-sta... | 08/18/2009 |
| 7573328 | Power amplifier A power amplifier is disclosed. In one embodiment, the power amplifier is a Class-D Amplifier having a differential pulse width modulator is disclosed. The differential pulse width modulator has an input for receiving an input signal, a first output for outputting a... | 08/11/2009 |
| 7557650 | Electronic signal generator with modulated cyclic ratio, compensated for variations in its power supply voltage A generator capable of supplying one or more output signals with a modulated cyclic ratio includes one or more formatting circuits each processing one input signal and one or more class D amplifiers powered with a power supply voltage and being driven by a correspon... | 07/07/2009 |
| 7554390 | Method and system for transitioning between operation states in an output system A closed loop amplifier system comprising a modulator that provides a pulse-width modulated (PWM) output signal based on an input signal, the modulator having a variable closed loop transfer function. The system also comprises a ramp generator that provides a ramp s... | 06/30/2009 |
| 7554391 | Amplifier having a virtual ground and method thereof An amplifier comprises first, second, and third modulators. The first modulator includes an input for receiving a first input signal, and an output for providing a first modulated output signal corresponding to the first input signal. The second modulator includes a... | 06/30/2009 |
| 7551022 | Power supply compensation The invention relates to an amplifier comprising amplification means (AM) comprising an input and an output, said amplification means (AM) comprising a switching output stage delivering at least one output signal (OUS) via said output, said amplification means being... | 06/23/2009 |
| 7548110 | Power amplifier and method for reducing common noise of power amplifier A power amplifier including a delta-sigma modulation module, a differential programmable dead-time-control module, and an output stage module is provided. The delta-sigma modulation module integrates and quantizes an error between a differential-mode input signal an... | 06/16/2009 |
| 7545207 | Control circuit and method for a switching amplifier In a control circuit and method for a high efficiency and low EMI switching amplifier, an input signal is compared with a reference signal to generate a comparison signal, and a control signal is generated in response to the comparison signal for a driver to generat... | 06/09/2009 |
| 7541865 | EER high frequency amplifier An EER high frequency amplifier wherein the dynamic range of the gain can be widened by performing a predetermined control of a device in a high frequency amplifying part and thereby enhancing the isolation within the device. In an EER high frequency amplifier (1... | 06/02/2009 |
| 7541864 | Power amplifier and pulse-width modulated amplifier The invention relates to a power amplifier having a phase amplification path with a phase amplification stage within said phase amplification path. Here the phase amplification stage receives a magnitude component of the power amplified output signal, and the phase ... | 06/02/2009 |
| 7538607 | Class D amplifier The invention is directed to a class D amplifier. According to the class D amplifier, sound data applied to an input terminal is supplied through a compensation circuit to a PWM circuit, from which a PWM signal is output. The PWM signal is converted to an analog sig... | 05/26/2009 |
| 7535296 | Class-E radio frequency power amplifier with feedback control A Class-E power amplifier includes a choke and a switch connected in series between a source of a supply voltage and circuit ground and connected to an inductively coupled coil. An output node of the amplifier is formed between choke and the switch and connected to ... | 05/19/2009 |
| 7528650 | Multi-channel digital amplifier, signal processing method thereof, and audio reproducing system having the same A multi-channel digital amplifier system to generate a pulse width modulation (PWM) signal having a different switching frequency in each channel, and a signal processing method thereof. The digital amplifier system includes a PWM conversion unit to convert a plural... | 05/05/2009 |
| 7528651 | Noise free implementation of PWM modulator combined with gate driver stage in a single die An integrated noise isolation circuit on a single silicon substrate die having a structural arrangement that minimizes noise. The integrated circuit including a noise sensitive circuit including an input stage; a noise generating circuit including an output stage; a... | 05/05/2009 |
| 7518443 | Amplifier circuit and method for reducing voltage and current noise An amplifier circuit with current noise reduction employs first and second variable impedance devices between a signal source and an amplifier. A modulation frequency generator establishes a modulation frequency fmod to alter the first and second impedanc... | 04/14/2009 |
| 7518441 | Signal processor for use with a power amplifier in a wireless circuit A signal processor has an input terminal and an output terminal for use in a wireless transmitter, for generating a radio frequency signal suitable for transmission, either with or without further power amplification. The signal processor separates an input signal i... | 04/14/2009 |
| 7518442 | Circuit and method for suppressing switching and supply-related errors in a PWM power stage by instantaneous per-pulse feedback A class D amplifier is provided. The class D amplifier includes a modulator and a class D power stage. The modulator provides a PWM output signal to the class D power stage. For each pulse of the PWM input signal, the class D amplifier provides a corresponding pulse... | 04/14/2009 |
| 7518445 | Systems, methods, and apparatuses for linear envelope elimination and restoration transmitters Systems, methods, and apparatuses are provided for linear envelope elimination and restoration transmitters that are based on the polar modulation operating in conjunction with the orthogonal recursive predistortion technique. The polar modulation technique enhances... | 04/14/2009 |