Tufts University

Qualcomm Incorporated

Chirag Sthalekar

Valencia Koomson

Xiangdong Zhang

Hakan Inanoglu

Leon Metreaud

An in-situ delay measurement is performed for an envelope-tracking power amplifier of an RF input signal. Because the delay measurement is in-situ, the delay measurement avoids the necessity to down convert and digitize a version of an RF output signal from the envelope-tracking power amplifier.

In-situ measurement of the delay between the envelope and the RF signal in envelope-tracking systems

A system and method, for measuring phase delay and amplitude of a near infrared signal emanating from tissue of an animal subject in response a near infrared signal input to such tissue, operate by processing a signal from an optical detector and a corresponding signal from an optical detector emulation circuit. In some aspects, the processed signals are fed into a phase delay detection system that provides an output thereof a digital measure of the phase delay of the received optical signal.

System and method for measuring phase delay and amplitude of an optical signal in animal tissue

A system and method, for measuring phase delay and amplitude of a near infrared signal emanating from tissue of an animal subject in response a near infrared signal input to such tissue, operate by processing a signal from an optical detector and a corresponding signal from an optical detector emulation circuit. In some aspects, the processed signals are fed into zero crossing detectors that in turn feed a time-to-digital converter providing at an output thereof a digital measure of the phase delay of the received optical signal.

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Burlington, MA, United States of America

Chirag Sthalekar