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| Application No. | Application Title | Issue Date |
| 20120049950 | CHOPPER STABILIZED AMPLIFIER A chopper stabilized amplifier may include a modulation circuit that performs a digital conversion on an input signal so as to convert the input signal into a first modulated signal by using a modulation signal, the modulation signal being a rectangular wave having a pr... | 03/01/2012 |
| 20120044018 | SYSTEMS AND METHODS FOR IMPROVED OVER-CURRENT CLIPPING Systems and methods for implementing over-current protection include reducing a clip level while an over-current condition is being detected. Once the over-current condition is no longer detected, the clip level is maintained for a specified period before allowing the c... | 02/23/2012 |
| 20110068861 | CHOPPER-STABILIZED INSTRUMENTATION AMPLIFIER This disclosure describes a chopper stabilized instrumentation amplifier. The amplifier is configured to achieve stable measurements at low frequency with very low power consumption. The instrumentation amplifier uses a differential architecture and a mixer amplifier to... | 03/24/2011 |
| 20110012674 | QUIET POWER UP AND POWER DOWN OF CLOSED LOOP DIGITAL PWM MODULATORS A switching audio amplifier circuit drives a switching audio amplifier stage using a digital PWM signal from an audio source. A PWM duty ratio modifier modifies an edge timing of the digital PWM signal to produce a modified digital PWM signal. A mode switch switches bet... | 01/20/2011 |
| 20100156527 | SPREAD SPECTRUM PULSE WIDTH MODULATION METHOD AND APPARATUS A circuit includes a variable frequency generator circuit and a quantization circuit. The variable frequency generator circuit provides a discontinuous switching frequency signal. The variable frequency generator circuit varies the discontinuous switching frequency sign... | 06/24/2010 |
| 20100123518 | POWER AMPLIFIER AND MODULATOR THEREOF A power amplifier including a loop filter, a frequency generator, a quantizer, and an output stage module is provided. The frequency generator outputs a signal with a reference frequency to the loop filter, and includes a logic circuit, a current array, and a dummy load... | 05/20/2010 |
| 20100109768 | METHOD AND APPARATUS FOR HIGH PERFORMANCE CLASS D AUDIO AMPLIFIERS The present disclosure provides a method and apparatus for high performance class D audio amplifier circuit that includes: a modulator circuit for receiving a PWM input signal and generating a control signal, a driver control circuit, a switching circuit, and a feedback... | 05/06/2010 |
| 20100109767 | DIGITAL PULSE WIDTH MODULATION FOR HALF BRIDGE AMPLIFIERS A switching amplifier drives a load or audio transducer. A digital integral noise shaping circuit converts a digital input such as audio content to an output digital pulse width modulated signal using an integrator. The integrator integrates the digital input, a variabl... | 05/06/2010 |
| 20100103015 | DIFFERENTIAL AMPLIFIER CIRCUIT AMPLIFYING DIFFERENTIAL SIGNALS WITH SELECTIVELY SWITCHING BETWEEN DIFFERENTIAL SIGNALS AND AD CONVERTER APPARATUS A differential amplifier circuit is provided with an operational amplifier and a modulator. The operational amplifier includes a feedback capacitance, and amplifies an analog input signal and outputs an amplified analog output signal. The modulator is connected to a vir... | 04/29/2010 |
| 20100097136 | A/D CONVERTER AND A/D CONVERSION METHOD In an A/D converter provided with an A/D converter circuit 101 for operationally amplifying an input signal and outputting an amplified signal, the A/D converter circuit 101 includes an initial value setting circuit 4a in addition to an ampli... | 04/22/2010 |
| 20100013554 | SWITCHING POWER AMPLIFIER AND METHOD OF CONTROLLING THE SAME A switching power amplifier having a pulse width modulation (PWM) signal generation unit that converts an input audio signal into a PWM signal with a predetermined carrier frequency, a correction unit that corrects the difference between an audio signal included in the ... | 01/21/2010 |
| 20100007410 | Switch method for switching class amplifiers In accordance with one the present disclosure, systems and methods are disclosed that include transmitting a binary signal from a signal source into a switch where the switch is in series between the signal source and a first circuit element. In addition, the switch is ... | 01/14/2010 |
| 20100007387 | TRIANGULAR WAVE GENERATING CIRCUIT HAVING SYNCHRONIZATION WITH EXTERNAL CLOCK A triangular wave generating circuit includes: an integrating unit including a capacitor, the integrating unit having an output for providing a triangular wave signal; first and second constant current sources for charging and discharging the capacitor; a switch unit fo... | 01/14/2010 |
| 20100001793 | HIGH EFFICIENCY MODULATING RF AMPLIFIER A high efficiency modulating RF amplifier (10) for amplitude modulating a signal defined by a phase information signal (1) and an envelope signal (2) comprises a power supply (30) arranged to provide an operating voltage under control of the ... | 01/07/2010 |
| 20100001794 | METHOD AND SYSTEM FOR INCREASING SAMPLING FREQUENCY FOR SWITCHING AMPLIFIERS The present invention is directed toward providing a system and method of reducing RF interference in switching amplifiers without degrading performance. In one embodiment, the sampling rate of coarse high voltage modulated pulsewidths are increased relative to the samp... | 01/07/2010 |
| 20090315620 | POWER AMPLIFIER A power amplifier based on EER technology or ET technology extracts an amplitude-modulated component from a modulated signal as an input signal which includes the amplitude-modulated component and a phase-modulated component, and decomposes the amplitude-modulated compo... | 12/24/2009 |
| 20090309654 | SYSTEM AND METHOD OF ALTERING A PWM CARRIER POWER SPECTRUM In a particular embodiment, a circuit device includes an input to receive a pulse-width modulated (PWM) signal and an output to send a modulated PWM signal. The circuit device further includes a pulse edge control circuit coupled between the input and the output. The pu... | 12/17/2009 |
| 20090302938 | LOW DELAY CORRECTOR A low delay corrector (LDC) unit includes a non-linear function generator and a filter. The nonlinear function generator receives a first signal and outputs a second signal in dependence on the first signal and a transfer function of the nonlinear function generator. Th... | 12/10/2009 |
| 20090302937 | AMPLIFIER USING SIGMA-DELTA MODULATION AND METHOD FOR ADJUSTING ERRORS OF THE AMPLIFIER THEREOF An amplifier includes a sigma-delta modulating circuit, a power stage circuit, two feedback components, an error suppressing circuit, and a selecting circuit. The sigma-delta modulating circuit generates two input voltages according to two input signals or one single-en... | 12/10/2009 |
| 20090302943 | CLASS D AMPLIFIER A class D amplifier including a PWM circuit, a buffer amplifying circuit, a low-pass filter, and two current sources is provided. The PWM circuit transfers an analog signal into a PWM signal. The buffer amplifying circuit amplifies the PMW signal and generates an amplif... | 12/10/2009 |
| 20090289705 | 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 modulator... | 11/26/2009 |
| 20090289704 | AMPLIFICATION CIRCUIT FOR DRIVING A DIFFUSER An amplification circuit for driving an audio signal diffuser that includes a generation circuit of a first pre-charging signal, the generation circuit including an amplifier provided with an input terminal for receiving the first pre-charging signal and provided with a... | 11/26/2009 |
| 20090284314 | AUDIO AMPLIFIER An audio amplifier includes a timing control circuit, an amplifying circuit, and a bias control circuit. The timing control circuit generates a first power down signal and a second power down signal, in which the first power down signal is asserted before the second pow... | 11/19/2009 |
| 20090284313 | AUDIO AMPLIFIER An audio amplifier, amplifying the audio signal, includes a first filtering circuit, and a second filtering circuit. The first filtering circuit generates an inverting driving voltage to drive a load according to the audio signal. The second filtering circuit generates ... | 11/19/2009 |
| 20090273396 | Pulse Area Modulation and High-Efficiency Linear Power Amplifier System Using the Same A linear power amplifier system using pulse area modulation includes: an envelop/phase decomposer for decomposing an input signal into an envelop signal and a phase signal; a pulse area modulator for modulating the envelop signal such that an area of the modulated envel... | 11/05/2009 |
| 20090245540 | AMPLIFICATION CIRCUIT AND METHOD THEREFOR In one embodiment, an amplification circuit receives an analog signal and adds another signal to the analog signal to modify the minimum amplitude of the analog input signal.... | 10/01/2009 |
| 20090243717 | Compact high-speed modulator driver method and apparatus Modulator driver for driving an electro-optical modulator in a high-speed optical communications system. In accordance with aspects of the present invention, a modulator driver is presented comprising an input differential limiting amplifier which is coupled to a distri... | 10/01/2009 |
| 20090243718 | High-speed modulator driver circuit with enhanced drive capability Modulator driver for driving an electro-optical modulator in a high-speed optical communications system. In accordance with aspects of the present invention, a modulator driver is presented comprising an input differential limiting amplifier providing differential outpu... | 10/01/2009 |
| 20090231030 | AUDIO POWER AMPLIFIER AND A PRE-AMPLIFIER THEREOF An audio power amplifier includes a pre-amplifier, an error amplifier, a comparator, a bridge circuit, and a feedback circuit, in which the gain of the pre-amplifier gradually increases when the audio power amplifier is powered on. The comparator generates a PWM signal ... | 09/17/2009 |
| 20090231035 | 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 compar... | 09/17/2009 |
| 20090213165 | OPTICAL SENSOR FOR A PRINTER A printing system includes a platen; a photosensor including an integrated lens; a light source configured to provide light, the light source including an integrated lens; and an aperture disposed to provide a field of view, the field of view being a portion of a plane ... | 08/27/2009 |
| 20090201083 | AMPLIFIER DEVICE AND SYSTEM USING THE DEVICE A device comprising: an input for an electric signal; an integrator stage connected to said input to provide an integrated signal; an amplifier stage electrically coupled to the integrator stage to receive said integrated signal and to provide an output signal. The devi... | 08/13/2009 |
| 20090189689 | 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 first sw... | 07/30/2009 |
| 20090184761 | 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 during a... | 07/23/2009 |
| 20090184765 | CLASS-D AMPLIFIER AND METHOD THEREFOR In one embodiment, a class-D amplifier (11) is configured to form first (DP) and second (DN) PWM signals each having a duty cycle that is proportional to a received analog input signal (12) and responsively to enable a switch (31, 32) to short the o... | 07/23/2009 |
| 20090179697 | 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 an in... | 07/16/2009 |
| 20090174473 | 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 the... | 07/09/2009 |
| 20090174472 | Apparatus and method for improving the feedback linearity of a 1.5-bit sigma-delta class-D amplifier A conversion circuit is provided for a 1.5-bit Σ-Δ class-D amplifier to improve the feedback linearity of the class-D amplifier, by periodically inverting and mixing a first positive feedback signal and a first negative feedback signal from the power stage of the clas... | 07/09/2009 |
| 20090167431 | Class D Amplifier Having PWM Circuit with Look-up Table A class D amplifier includes a noise-shaping modulator, a pulse width modulator, and a pulse amplifier. The noise-shaping modulator receive a pulse code modulated (PCM) signal and produces an oversampled PCM signal. The pulse width modulator produce a pulse width modula... | 07/02/2009 |
| 20090160547 | 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 signa... | 06/25/2009 |
