Time-Of-Flight distance sensor with enhanced dynamic range
by Daniel Van Nieuwenhove, Ward Van Der Tempel, Riemer Grootjans, Maarten Kuijk
International Journal of Intelligent Systems Technologies and Applications (IJISTA), Vol. 5, No. 3/4, 2008

Abstract: A Time-Of-Flight distance measurement sensor is presented. Detection and mixing is done with an in-substrate Current Assisted Photonic Demodulator. Background light suppression and high dynamic range is achieved using a Variable Transimpedance Amplifier. The pixel also comprises sample and hold circuitry and special low pass filters, for in-pixel averaging, with a 10 Hz to 10 kHz tuneable cut-off frequency. Proof-of-principle measurements on a standard Complementary Metal Oxide Semiconductor 0.35 µm prototype measuring 50 μm × 50 μm with a fill factor of 60% are included.

Online publication date: Tue, 18-Nov-2008

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