Avago Technologies International Sales Pte. Limited

Broadcom Corporation

Darwin Cheung

Xicheng Jiang

Jungwoo Song

Chi Mo

Vinay Chandrasekhar

Xiaofeng Lin

Mark Chambers

Yee Ling Cheung

Josephus A E P Van Engelen

Kareem Abdelghani Ibraheem Mohamed Ragab

An apparatus includes a switched-capacitor resistor that provides an equivalent resistance that can be used as a reference resistor. The switched-capacitor resistor includes a capacitor and a pair of switches that alternately switch (e.g., open and close) in order to charge and discharge the capacitor. The switching frequency of the switches can be controlled by a clock phase generator that generates non-overlapping pulses. To further control the frequency, a frequency locked loop circuit can also be used.

Method and apparatus for precision temperature sensing

A device (e.g., SAR ADC device) include a DAC circuit and generates a digital output based on logic circuitry that includes SAR logic. Additional logic circuitry includes delta modulation circuitry and dynamic element matching circuitry. The delta modulation circuitry provides several digital outputs of the SAR DAC, while the dynamic element matching circuitry selects a different set of capacitors from the DAC circuit. Each cycle is added together and averaged, and then added to the digital output from the SAR logic.

Incremental delta modulation for analog to digital converter signal to noise ratio and linearity enhancement

A signal driving system generates an output swinging between a first power supply (e.g., about 1.2 Volts), powering first and second drivers, and a second power supply (e.g., about 3.3 Volts), powering a first current mirror. The second power supply is generated external to the signal driving system and is used to allow for a desired common-mode differential output signal range. However, the second power supply produces voltage at a level above a rating of the devices in the signal driving system. Therefore, protection devices are used to protect the elements of the signal driving system from the second power supply. Accordingly, through use of the signal driving system of the present invention, a high voltage current mode driver can operate in a low voltage process without damaging the devices in the signal driving system.

Signal driving system

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Irvine, CA, United States of America

Darwin Cheung