Iwatt Inc.

Etherwhere Corporation

Dialog Semiconductor Gmbh

Other

Zerog Wireless, Inc.

Dickson T Wong

Farrokh Farrokhi

Arthur J Collmeyer

Mark D Telefus

Edmund Gregory Lee

Junjie Zheng

Anatoly Shteynberg

Harry Rodriguez

Yong Li

Jianming Yao

Paul Frederic King

Charles R Geber

Yimin Chen

Mark Robert Muegge

David B Manner

Thomas H Lee

Allen Samuels

Liang Yan

Xiaoyan Wang

Guang Feng

Chuanyang Wang

Jiang Chen

Clarita Chiting Knoll

Thomas Szepesi

Chenglong Zhang

Chuangyang Wang

A positioning system is provided in which a client device samples a transmission from any suitable terrestrial wireless source. The resulting samples are correlated with replica samples to determine a position of the client device using time-difference-of-arrival-based calculations.

TDOA-based positioning system using terrestrial wireless signal sources

A satellite-based positioning system (SPS) signal processing technique re-samples a received series of PRN sequences from an SPS satellite to align them with a nominal sampling rate for a corresponding series of perfect reference PRN replica sequences.

Fast fix using a perfect reference in a satellite-based positioning system

A switching power converter is provided with an overvoltage protection circuit that monitors the differential data signal voltages in a data interface such as a USB data interface powering a load device to detect soft short conditions.

Short circuit protection for data interface charging

A satellite-based positioning receiver is provided that is configured to combine non-concurrent sets of pseudoranges all taken at a common location to determine at least a 2D position of the common location.

Method and apparatus for determining device location

A universal serial bus (USB) charger provides power to a client device. A USB connector interfaces with a client device and receives a request for the output voltage of the USB charger to be at a specific value. If the requested voltage level is lower than the current output voltage level, the output voltage level is set to the requested level and a bleeder circuit is enabled to discharge the output capacitor of the USB charger.

USB power converter with bleeder circuit for fast correction of output voltage by discharging output capacitor

Fast fix using perfect reference in a satellite-based positioning system

A power converter with a dynamic preload. The power converter includes a magnetic component coupled between an input and an output of the power converter. The output of the power converter has an output voltage for providing power to a load. A switch is adapted to control current through the magnetic component according to on and off times of the switch. A dynamic preload circuit is coupled to the output of the power converter. The dynamic preload has loading characteristics that are adjusted responsive to a signal indicative of an output voltage at the output of the power converter.

Power converter with dynamic preload

A TRIAC dimmer controller for an LED lamp dynamically adjusts the amount of additional current supplied to the TRIAC dimmer based on the TRIAC dimmer operating mode. A TRIAC dimmer current controller continually senses the TRIAC dimmer current loading and determines a TRIAC dimmer operating mode based on the detected current. The TRIAC dimmer controller compares the detected current with a threshold current value called a TRIAC holding current, and adjusts the amount of bleeder current based on the difference between the detected current and the threshold current value. By continually sensing the TRIAC dimmer current loading, the LED controller regulates the amount of bleeder current supplied to the TRIAC dimmer using a single sink current path to satisfy the TRIAC dimmer current demands of multiple TRIAC dimmer operating modes.

Adaptive holding current control for LED dimmer

A system for measuring the pseudo range from a first GPS sensor to a designated navigational satellite, for use in a satellite positioning system (SPS) is comprised of first and second GPS sensors for receiving and recording first and second portions of the signal transmitted by the designated navigational satellite, the recordings referred to as the first and second datagrams. The first and second datagrams are transmitted to a datagram processing facility wherein the pseudo range from the first GPS sensor to the designated navigational satellite is extracted. The datagram processing facility for extracting the pseudo range is further comprised of a pseudo range engine for extracting a pseudo range from a datagram received by the first GPS sensor. The location of which is to be determined, the extraction accomplished with the aid of a perfect reference; and a perfect reference engine for generating a perfect reference from a datagram originating with a second GPS sensor designated for the express purpose of perfect reference generation.

Signal processing techniques for improving the sensitivity of GPS receivers

A method for estimating the location of a beacon from an ensemble of measurements associated with said beacon, where, contained in each measurement, are GPS data from which surfaces of location may be extracted, together with the ID's of beacons detectable at the point of measurement, is disclosed. The method comprises extracting the canonical set of surfaces of location implicit in each of the associated measurements, and determining the estimate of the location of the beacon as the point for which the sum of the squares of the distances to each of the surfaces so extracted is minimized. A system for the compilation of a database of beacon locations from measurements containing a time-stamped recording of the composite GPS signal (which recording is referred to as a datagram), together with the ID's and associated signal strengths of beacons detectable at the point of measurement, is also disclosed. The system comprises GPS signal processing means for extracting, from each time-stamped datagram, the canonic set of surfaces of location, and beacon location estimation means for estimating the location of a beacon from an ensemble of surfaces of location associated with said beacon.

System framework for mobile device location

A power converter delivers electrical power from an electrical power source to a load according to a plurality of operation modes, where at least one of the operation modes is a peak current switching mode. Under the peak current switching mode, a switch controller controls the switch in the power converter to be kept on until the current through the switch reaches a peak current value corresponding to a given phase of the input voltage signal to the power converter. The peak current values have a reference shape, which may be a trapezoidal. The power converter may have any topology, such as a flyback-type power converter or a boost-type power converter.

System and method for input current shaping in a power converter

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Burlingame, CA, United States of America

Dickson T Wong