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Continuous-wave time-of-flight CMOS detector with commonmode feedback for strong background light applications Host Publication: IEEE SENSORS 2015 Authors: H. Ingelberts, R. Deleener, S. Boulanger and M. Kuijk Publisher: IEEE Publication Date: Nov. 2015 Number of Pages: 4 ISBN: 978-1-4799-8202-8
Abstract: A novel CMOS demodulation detector for time-offlightapplications is presented. It can handle large amounts ofbackground light by removing the resulting common-mode signalat the detector level. A common-mode feedback circuit is used ontop of a current-assisted photonic demodulator (CAPD) toremove the incoming light that is not correlated to themodulation signal. A dynamic element matching (DEM) schemeis implemented to remove mismatches in the compensatingcurrent sources that operate at nanoampere currents. Thedetector is fabricated in a 0.35 µm process and is used to measurethe phase of a 1 MHz square-wave modulated laser signal on topof a background light, more than 100 times more powerful,without the use of optical filters. Measurements are performedwith and without DEM, demonstrating its need. The detector is acandidate for long range outdoor time-of-flight applicationswhere background light can become multiple orders ofmagnitude larger than the modulated light.
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