Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Application No. | Application Title | Issue Date |
| 20120081179 | DUTYCYCLE ADJUSTMENT TO IMPROVE EFFICIENCY OF A DIGITAL RF-PA An amplification unit reduces a duty cycle of a digital signal at a carrier radio frequency to optimize the efficiency of the RF power amplifier that amplifies the reduced duty cycle signal. An exemplary amplification unit includes a duty cycle controller and a digital ... | 04/05/2012 |
| 20120044020 | METHOD AND APPARATUS FOR SENSING A CURREN FOR VARYING IMPEDANCE LOADS Recently, there has been an increased desire to measure load currents of class-D amplifiers to improve performance. The traditional solution has been to include one or more discrete components in series with the load, but this degrades performance. Here, however, circui... | 02/23/2012 |
| 20120039487 | 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 the first resistor. An operational amplifier is arranged such that its inv... | 02/16/2012 |
| 20120027127 | AMPLIFIER An amplifier includes a separating unit, a generator, first to fourth switching amplifiers, and an outputting unit. The separating unit separates a pulse signal into a first separated pulse signal and a second separated pulse signal. The generator generates first to fou... | 02/02/2012 |
| 20120025910 | 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 comprises a closed-loop analog driver that is coupled to the digital modulator... | 02/02/2012 |
| 20110316627 | 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 supply rail for measuring the power supply current. An error amplifier is c... | 12/29/2011 |
| 20110310990 | POWER AMPLIFICATION APPARATUS, OFDM MODULATION APPARATUS, WIRELESS TRANSMISSION APPARATUS, AND DISTORTION REDUCTION METHOD FOR POWER AMPLIFICATION APPARATUS A power amplification apparatus that performs an inverse fast Fourier transformation on data allocated to a plurality of sub-carriers, converts time-domain data output in parallel from the inverse fast Fourier transformation into a time-domain analog signal, performs a ... | 12/22/2011 |
| 20110286611 | 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 loops of noise current that occur are balanced while each switch is turned... | 11/24/2011 |
| 20110285463 | OUTPUT CIRCUITS WITH CLASS D AMPLIFIER Output circuits using pulse width modulation (PWM) and/or pulse density modulation (PDM) are described. In one aspect, a PWM output circuit includes a PWM modulator that operates based on a square wave signal instead of a sawtooth or triangular wave signal. In another a... | 11/24/2011 |
| 20110260794 | HIGH FREQUENCY POWER AMPLIFIER A high frequency power amplifier includes first and second transistors connected in parallel and amplifying a high frequency signal; a first switch connected to outputs of the first and second transistors and which connects an input terminal selectively to first and sec... | 10/27/2011 |
| 20110260793 | Ground-referenced common-mode amplifier circuit and related method Disclosed is an amplifier circuit configured to amplify a pulse stream. The amplifier circuit comprises a switching block including a first switch operable to couple an output node of the switching block to a positive reference voltage, a second switch operable to coupl... | 10/27/2011 |
| 20110254625 | 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 voltage control means is operative to lower the voltage at the su... | 10/20/2011 |
| 20110248781 | 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 amplifier enters or exits standby mode. A duplicate feedback network is us... | 10/13/2011 |
| 20110243352 | Concept, method and apparatus of improved distortion switched-mode amplifier Systems and methods for switched-mode amplifiers having improved harmonic distortion are disclosed. High order in-band filtering is enabled without undue trade-off of distortion due to intermodulation/aliasing. A pre-modulation block is introduced, deployed between a lo... | 10/06/2011 |
| 20110237206 | 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 power-amplified version of the single-ended input signal. The switched power amplifi... | 09/29/2011 |
| 20110235831 | DRIVE DEVICE There is provided a drive device capable of driving a capacitive load with efficiency and with low power consumption while keeping quality input reproducibility for output signal. A switching drive circuit 10f repeatedly performs operations in the order of... | 09/29/2011 |
| 20110227645 | CLASS-D POWER AMPLIFIER A class-D power amplifier includes a switching power source section, a synchronization signal generation section and a class-D power amplifying section. The synchronization signal generation section takes out of the switching power source section a clock signal having a... | 09/22/2011 |
| 20110215867 | REDUCING PULSE ERROR DISTORTION A class D amplifier that includes circuitry to apply a non-linear correction to pulse error distortion. The amplifier includes an output voltage controlling circuit, comprising at least two switches, controlled by a modulator; an output inductor, coupling the switching ... | 09/08/2011 |
| 20110210790 | 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 switching amplifier. In some embodiment, the switching amplifier is a dua... | 09/01/2011 |
| 20110181356 | SWITCHING DEVICE OF DIGITAL AMPLIFIER AND METHOD FOR DRIVING THE SAME A switching device of a digital amplifier and a method for controlling the same are disclosed. In accordance with the present invention, a linearity is maintain even for a short pulse width since a data signal having a pulse width shorter than a predetermined length. Mo... | 07/28/2011 |
| 20110148521 | 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 supply rail for measuring the power supply current. An error amplifier is c... | 06/23/2011 |
| 20110133836 | CLASS-D AMPLIFIER Class D amplifier is provided. The class D amplifier includes at least a block; each block includes an input circuit, an integrator, a comparator, a driving circuit and two feedback circuits. The input circuit receives a digital input to provide a differential pair of a... | 06/09/2011 |
| 20110109387 | Power amplification apparatus for envelope modulation of high frequency signal and method for controlling the same A power amplification apparatus and method provide for controlling envelope modulation of a Radio Frequency (RF) signal. The power amplification apparatus includes a linear amplifier configured to receive an input signal to be amplified, and generate a linear output sig... | 05/12/2011 |
| 20110109386 | 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 unit, a first power transistor set, a second power transistor set and a powe... | 05/12/2011 |
| 20110110538 | 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, and the output power restraint unit is capable of restraining output powe... | 05/12/2011 |
| 20110068870 | CLASS-D AMPLIFIER WITH DUAL FEEDBACK LOOP A class-D amplifier with dual feedback loop scheme has a gain adjusting circuit, a second-order integrator, two comparators, a logic circuit and an output driver. Two differential output terminals of the class-D amplifier are connected to two differential amplifiers of ... | 03/24/2011 |
| 20110068869 | SINGLE-ENDED CLASS-D AMPLIFIER WITH DUAL FEEDBACK LOOP SCHEME A single-ended class-D amplifier with dual feedback loop scheme has a gain adjusting circuit, a second-order integrator, two comparators, a logic circuit, an output driver and an inverter. The output driver cooperates with the inverter to produce a differential signal. ... | 03/24/2011 |
| 20110063027 | Class-D amplifier A class-D amplifier for generating from an input signal a digital signal for driving a load, includes an output limit instruction generating section that detects that the digital signal falls outside a limit range and that outputs an output limit instruction signal, an ... | 03/17/2011 |
| 20110057726 | SWITCHING AMPLIFIER A switching amplifier (200; 300; 400; 500) comprising: a switch (202; 302) configured to electrically connect and disconnect a first pin (202a; 302a) of the switch (202; 302) to a second pin (202b; 302 | 03/10/2011 |
| 20110051842 | 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 branch and is operated in an out-phasing configur... | 03/03/2011 |
| 20110043283 | VARIABLE FREQUENCY CLASS-D AMPLIFIER, CONTROL METHOD THEREOF, AND RAMP GENERATOR THEREFOR A class-D amplifier includes a ramp generator to provide a ramp signal having a frequency varying with an audio input signal, and a modulator to convert the audio input signal to a pulse width modulation signal according to the ramp signal for a driver to drive a load d... | 02/24/2011 |
| 20110037517 | Concept, method and apparatus of improved distortion switched-mode amplifier Systems and methods for switched-mode amplifiers having improved harmonic distortion are disclosed. High order in-band filtering is enabled without undue trade-off of distortion due to intermodulation/aliasing. A pre-modulation block is introduced, deployed between a lo... | 02/17/2011 |
| 20110032034 | SWITCHED MODE AMPLIFIER A switched mode amplifier includes a voltage source, a switched amplifier, a controller and a feedback unit. The switched amplifier sources or sinks a current to or from a load. The load and the current define a voltage over the load. The controller generates control si... | 02/10/2011 |
| 20110025415 | 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 signal inputs. The differential RF amplifier circuit includes a first pair... | 02/03/2011 |
| 20110019728 | 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... | 01/27/2011 |
| 20110012676 | SYSTEMS AND METHODS OF REDUCED DISTORTION IN A CLASS D AMPLIFIER Systems and methods for reduced distortion in a class D amplifier are provided. An “ideal” digital output signal is produced. The “ideal” digital output signal is then compared to the actual output signal in an error amplifier. The integrator input is the differ... | 01/20/2011 |
| 20110012677 | CURRENT SENSING A switching amplifier comprising: an output driving circuit (400) including a pair of switching transistors (M1, M2) connected in series between a pair of supply voltage lines (VP, gnd); a switch driver circuit (204a) config... | 01/20/2011 |
| 20110006843 | Offset voltage correction circuit and class D amplifier A class D amplifier includes an input unit that inputs an input signal and an integrator which includes a differential operational amplifier having an offset voltage correction function. The integrator integrates the input signal input. A pulse-width modulator modulates... | 01/13/2011 |
| 20110006844 | Class D Amplifier Control Circuit and Method Circuit and method for a Class D amplifier. In one exemplary embodiment, an audio amplifier is disclosed. A closed loop configuration for driving high and low side driver transistors is provided, each circuit is compatible with advanced sub micron semiconductor processe... | 01/13/2011 |
| 20100327973 | 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 period pattern signal whose period varies. The switching amplifier circu... | 12/30/2010 |
