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| Number | Title | Issue Date |
| 8179914 | Network slot synchronization scheme for a computer network communication channel Synchronization within a common communication channel having designated transmission time slots for various devices of a computer network is maintained by allowing transmissions within the channel outside of a network device's designated time slot when a clear chann... | 05/15/2012 |
| 8174204 | Lighting system with power factor correction control data determined from a phase modulated signal A light emitting diode (LED) lighting system includes a power factor correction (PFC) controller that determines at least one power factor correction control parameter from phase delays of a phase modulated signal. In at least one embodiment, a peak voltage of the p... | 05/08/2012 |
| 8165835 | Complex wavelet filter based power measurement and calibration system A power measurement and calibration system provides power and line frequency measurements by using a bandpass filter having complex voltage and current outputs from which real and imaginary power components can be determined. Calibration of the filter may be omitted... | 04/24/2012 |
| 8130127 | Discrete-time delta-sigma modulator with improved anti-aliasing at lower quantization rates A discrete time delta-sigma modulator circuit, which may be used to implement an analog-to-digital converter (ADC) provides improved anti-aliasing performance when lower quantization rates are selected, by maintaining the clocking rate of a first stage in the delta-... | 03/06/2012 |
| 8120341 | Switching power converter with switch control pulse width variability at low power demand levels A power control system includes a switch mode controller to control the switching mode of a switching power converter. The switch mode controller generates a switch control signal that controls conductivity of a switch of the switching power converter. Controlling c... | 02/21/2012 |
| 8102127 | Hybrid gas discharge lamp-LED lighting system A lighting system and method combine at least one LED and at least one gas discharge lamp within a common housing. The lighting system includes a control system to dependently operate each LED and each gas discharge lamp during overlapping, non-identical periods of ... | 01/24/2012 |
| 8093951 | Pulse-width modulated (PWM) audio power amplifier having output signal magnitude controlled pulse voltage and switching frequency An audio switching power amplifier having an output pulse voltage selected in conformity with an indication of the output signal amplitude provides lower electromagnetic interference (EMI) in class-D amplifier implementations, in particular, in inductor-less designs... | 01/10/2012 |
| 8076920 | Switching power converter and control system A switching power converter tracks a time-varying input voltage during each cycle of the input voltage to provide power factor correction. The switching power converter includes a switch with a frequency and duty cycle modulated control signal. The switch controls t... | 12/13/2011 |
| 8068622 | Method and apparatus for controlling a selectable voltage audio power output stage A method and apparatus for controlling a selectable voltage audio power output stage provides a mechanism for raising the selected power amplifier output voltage in time for the arrival of signal peaks to avoid clipping. Signal peaks may either be delayed by delayin... | 11/29/2011 |
| 8059607 | Methods and systems for implementing transmit diversity over a wireless medium and networks using the same A spatial transmit diversity method includes transmitting data at a selected rate from a first antenna and awaiting an acknowledgement indicating successful receipt by the receiving terminal of the data transmitted at the selected rate from the first antenna. The da... | 11/15/2011 |
| 8058895 | Single-resistor static programming circuits and methods A method of programming an integrated circuit to operate in a selected operating mode includes assigning different resistance values to correspond to different operating modes of the integrated circuit, wherein the different resistance values are non-zero finite val... | 11/15/2011 |
| 8040703 | Power factor correction controller with feedback reduction A power control system includes a feedback loop having a power factor correction (PFC) and output voltage controller and a switching power converter. The switching power converter includes an inductor to supply charge to an output capacitor and a switch to control i... | 10/18/2011 |
| 8022683 | Powering a power supply integrated circuit with sense current A power control system and method senses input and/or output voltages of a power supply using sense currents in order for an integrated circuit (IC) switch state controller to generate a control signal to control a switch of the power control system. By sensing sens... | 09/20/2011 |
| 8018171 | Multi-function duty cycle modifier A system and method modify phase delays of a periodic, phase modulated mains voltage to generate at least two independent items of information during each cycle of the periodic input signal. The independent items of information can be generated by, for example, inde... | 09/13/2011 |
| 8014176 | Resonant switching power converter with burst mode transition shaping A resonant switching power converter having burst mode transitioning operates during low or zero load conditions with reduced audible noise and component stresses, while improving efficiency. Pulse bursts are generated with a beginning and/or ending pulse duration t... | 09/06/2011 |
| 8009077 | Delta-sigma analog-to-digital converter (ADC) circuit with selectively switched reference A delta-sigma analog-to-digital converter (ADC) circuit improves performance by reducing the amount of noise and other error sampled by the reference switching circuit. The reference is operated such that one or more reference capacitors remain coupled to an input s... | 08/30/2011 |
| 8008975 | Gate-boosted, variable voltage supply rail amplifier In at least one embodiment, an electronic system includes an amplifier having an on-chip charge pump to provide a gate boost voltage to boost a gate voltage of at least one on-chip field effect transistor (FET) of an output stage of an amplifier. In at least one emb... | 08/30/2011 |
| 8008902 | Hysteretic buck converter having dynamic thresholds A hysteretic buck converter provides improved regulation control, in particular for buck converter standby operation. A comparison circuit compares the output voltage of the buck converter to a waveform that is generated from an indication of the output current of t... | 08/30/2011 |
| 8008898 | Switching regulator with boosted auxiliary winding supply A boosted auxiliary winding power supply for a switched-power converter circuit provides operating voltage for control and other circuits early in the start-up phase of converter operation. A boost circuit has an input coupled to the auxiliary winding to boost the v... | 08/30/2011 |
| 7994863 | Electronic system having common mode voltage range enhancement An electronic system generates at least one floating supply voltage, wherein during operation of the circuit the floating supply voltage tracks a common mode voltage of first and second differential input signals. By tracking the common mode voltage, in at least one... | 08/09/2011 |
| 7990212 | Modulated audio amplifier output enable control A modulated amplifier output enable control eliminates audible pops when enabling and disabling an audio amplifier output stage. The output of the audio amplifier is transitioned between an enabled state and a disabled state using a modulated control signal that ena... | 08/02/2011 |
| 7974996 | Math coprocessor A math coprocessor 1300 includes a multiply-accumulate unit 1600. Multiplier-accumulate unit 1600 includes a multiplier array 1603 for selectively multiplying first and second operands, the first and second operands having a data type sel... | 07/05/2011 |
| 7971170 | Methods for forming area-efficient scan chains in integrated circuits, and integrated circuits embodying the same A method of forming a scan chain for testing an integrated circuit includes examining an interconnection of register elements in an integrated circuit design. A register element segment is identified which includes a source register element having an output and a de... | 06/28/2011 |
| 7969125 | Programmable power control system A power control system includes a switching power converter and a programmable power factor correction (PFC) and output voltage controller. The programmable PFC and output voltage controller generates a control signal to control power factor correction and voltage r... | 06/28/2011 |
| 7949139 | Technique for subwoofer distance measurement The present invention automatically corrects for subwoofer or other speaker crossover settings or other parameters by providing an adjustable factor passed upon not only pulse location, but on pulse width. In FIG. 2, as the low-pass frequency of the subwoofer... | 05/24/2011 |
| 7915995 | Compensation of field effect on polycrystalline resistors A resistive circuit includes a first terminal and a second terminal and polycrystalline first and second resistive segments coupled between the first and second terminals. A third terminal A is coupled to the first resistive segment, and a third terminal B is couple... | 03/29/2011 |
| 7903825 | Personal audio playback device having gain control responsive to environmental sounds A personal audio playback device having gain control responsive to environmental sounds provides for improved enjoyment of program material played back through headphones, while further providing features for personal safety and communications with others. A microph... | 03/08/2011 |
| 7903010 | Delta-sigma analog-to-digital converter (ADC) having a serialized quantizer output A delta-sigma analog-to-digital converter (ADC) having a serialized quantizer output has a data rate greater than a quantization rate of the delta-sigma modulator, but less than a bit rate determined by the product of the number of bits required to represent the inp... | 03/08/2011 |
| 7894216 | Switching power converter with efficient switching control signal period generation A power control system includes a switching power converter and a controller, and the controller responds to a time-varying voltage source signal by generating a switch control signal having a period that varies in accordance with at least one of the following: (i) ... | 02/22/2011 |
| 7888922 | Power factor correction controller with switch node feedback A power control system includes a switching power converter and a power factor correction (PFC) and output voltage controller. The PFC and output voltage controller provides a control signal to a switch to control power factor correction and regulate output voltage ... | 02/15/2011 |
| 7863828 | Power supply DC voltage offset detector A power supply output voltage direct current (DC) offset detector determines a DC offset in a power supply output voltage signal, and the output voltage signal has a DC component and an alternating current (AC) “ripple” component. Once during each period of the ... | 01/04/2011 |
| 7860474 | Circuits and methods for controlling switching noise in switched-mode circuits A method of controlling noise in a pulse width modulation circuit includes varying a sample frequency and a range of information levels, wherein each sample within a data sample stream at the sample frequency represents a level within the range of information levels... | 12/28/2010 |
| 7852017 | Ballast for light emitting diode light sources A lighting source ballast utilizes switching and control technology to convert an alternating current (AC) phase modulated dimmer input voltage into an approximately constant drive current to illuminate one or more light emitting diodes (LED(s)). In at least one emb... | 12/14/2010 |
| 7840015 | Thermal feedback for switch mode amplification A thermal sensor at the output of a switching amplifier senses heat dissipation at the output switch. If an overheating condition is sensed, gain of the digital input signal is lowered to reduce output power of the audio output signal. ... | 11/23/2010 |
| 7835772 | FM output portable music player with RDS capability A FM output portable audio player is provided for digitally coupling audio signals generated therein to be broadcast through a radio receiver system, such as an automobile radio. The audio player includes an audio signal source for generating digital audio output si... | 11/16/2010 |
| 7830209 | Signal level selected efficiency in a charge pump power supply for a consumer device audio power output stage A charge pump power supply for a consumer device audio power stage has an efficiency selected according to signal level. The frequency of operation of the charge pump and/or the effective size of a switching transistor bank is adjusted based upon a volume (gain) set... | 11/09/2010 |
| 7826578 | Circuits and methods for noise management in systems including an asynchronously-operable data port A data processing system including an input data port for receiving input data samples asynchronous to a native clock signal and having an input sample rate, a first sample rate converter for converting the data samples from the input sample rate to a sample rate sy... | 11/02/2010 |
| 7825845 | Digital output semiconductor magnetic field sensor integrated circuit A digital output semiconductor magnetic field sensor integrated circuit provides a low-cost and dense packaging solution for providing digital indicators of magnetic field magnitudes. A delta-sigma modulator based analog-to-digital converter (ADC) is integrated on a... | 11/02/2010 |
| 7822214 | Audio power output system with shared output blocking capacitor An audio power output system with shared output blocking capacitor provides reduced cost and volume in multi-channel audio power output systems. A pair of transducers are series-connected in opposite polarity and a common DC blocking capacitor provides the return pa... | 10/26/2010 |
| 7821237 | Power factor correction (PFC) controller and method using a finite state machine to adjust the duty cycle of a PWM control signal A power factor correction (PFC) controller and method uses a finite state machine to adjust the duty cycle of a pulse width modulation (PWM) switching control signal. The PFC controller has a target current generator that receives the link output voltage and generat... | 10/26/2010 |
