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Lock-in Pixel Using a Current-Assisted Photonic Demodulator Implemented in 0.6 µm Standard Complemetary Metal-Oxide-Semiconductor This publication appears in: Japanese Journal of Applied Physics Authors: W. van der Tempel, D. Van Nieuwenhove, R. Grootjans and M. Kuijk Volume: 46 Issue: Issue 4B Pages: 2377-2380 Publication Date: Apr. 2007
Abstract: A complemetary metal-oxide-semiconductor (CMOS) lock-in pixel sensor based on a current-assisted photonic demodulation (CAPD) detector is described. The CAPD detector provides high demodulation contrast and yields excellent photo-response. The prototype followed standard active pixel sensor (APS) architecture and was fabricated using a 0.6 um CMOS process from AMS. We obtained a near infrared (NIR) light responsivity of 0.26 A/W at 860 nm. The pixel exhibits demodulation contrast of nearly 100% at low frequencies and above 90% even up to 2 MHz. The phase response is linear up to 2 MHz, and even up to 10 MHz with the appropriate phase extraction equations.
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