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Brent Wilson, Paul Highley, Kenneth W Fernald: Method and apparatus for calibration of a low frequency oscillator in a processor based system. Silicon Labs CP, Howison & Arnott L, July 31, 2007: US07250825 (58 worldwide citation)

Method and apparatus for calibration of a low frequency oscillator in a processor based system. A method for calibrating an on-chip non-precision oscillator. An on-chip precision oscillator is provided having a known frequency of operation that is within an acceptable operating tolerance. The on-chi ...


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William Gene Durbin, Brent Wilson: Magnetic stripe reader. Silicon Labs CP, Howison & Arnott L, January 16, 2007: US07163148 (56 worldwide citation)

A magnetic stripe card reader for reading a magnetic stripe on a card having at least one track of magnetically stored information stored thereon as a stream of encoded discrete data bits separated by bit times is disclosed. Aa magnetic head is provided for reading the magnetic pulses as the magneti ...


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Kafai Leung, Ka Y Leung: DMA controller that restricts ADC from memory without interrupting generation of digital words when CPU accesses memory. Silicon Labs CP, Howison & Arnott, March 6, 2007: US07188199 (26 worldwide citation)

DMA controller for mixed signal device. A mixed signal integrated circuit with memory control is disclosed. A data conversion circuit is provided that is operable to receive an analog input signal and convert discrete samples thereof at a predetermined sampling rate to a digital representations ther ...


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Donald E Alfano, Danny Allred, Douglas S Piasecki, Kenneth W Fernald, Ka Y Leung, Brian Caloway, Alvin Storvik, Paul Highley, Douglas R Holberg: Reconfigurable interface for coupling functional input/output blocks to limited number of i/o pins. Silicon Labs CP, Howison & Arnott, January 30, 2007: US07171542 (25 worldwide citation)

A reconfigurable processor system n an intergrated circuit includes a processor core that operates on a set of instructions to carry out predefined processes. A plurality of input/output pins are provided for interfacing with external signals. A reconfigurable interface interfaces between the proces ...


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Ken Fernald: Method and apparatus for protecting internal memory from external access. Silicon Labs CP, Howison & Arnott L, October 16, 2007: US07284106 (19 worldwide citation)

Method and apparatus for protecting internal memory from external access. A method for protecting a memory space from external access is provided. A plurality of lock bits are stored in a location in memory, each associated with a separate logical portion of the memory space and determinative as to ...


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Ka Y Leung, Kafai Leung: SAR analog-to-digital converter with two single ended inputs. Silicon Labs CP, Howison & Arnott, April 19, 2005: US06882298 (16 worldwide citation)

Self calibrating SAR analog-to-digital converter. A data converter for converting analog data on a differential data input having a positive analog input terminal and a negative analog input terminal to digital data. The data converter includes a first single ended successive approximation register ...


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Kenneth W Fernald: Voltage reference circuit using PTAT voltage. Silicon Labs CP, Howison & Arnott, October 10, 2006: US07119527 (16 worldwide citation)

A voltage reference generator is disclosed that includes a current generator for generating a current that is proportional to absolute temperature (PTAT), the current generator having an internal resistance. This provides a PTAT current that is proportional to the resistance and wherein the temperat ...


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Douglas S Piasecki, Alvin C Storvik II: IC with digital and analog circuits and mixed signal I/O pins. Silicon Labs CP, Howison & Arnott L, May 31, 2005: US06900660 (16 worldwide citation)

An integrated circuit providing mixed signal processing. I/O pin interface circuits include logic gates and other circuits for processing digital and analog signals. Processor-controlled configuration circuits allow the various I/O pin interface circuits to process either analog or digital circuits. ...


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Ka Y Leung, Douglas R Holberg, Kafai Leung: Capacitor calibration in SAR converter. Silicon Labs CP, Howison & Arnott L, May 10, 2005: US06891487 (14 worldwide citation)

Capacitor calibration in SAR converter. A method for calibrating a switched capacitor array in a SAR data converter is disclosed, which array includes a plurality of primary capacitors having a common node plate interfaced to a common node and a switched plate interfaced to a switch that is operable ...