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Proceedings Paper

High-impedance high-frequency silicon detector response for precise receiverless optical clock injection
Author(s): Christof Debaes; Diwakar Argawal; Aparna Bhatnagar; Hugo Thienpont; David A. B. Miller
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Paper Abstract

We report the direct injection of precise clock signals into standard CMOS circuits using short optical pulses by a novel receiverless scheme that eliminates the delay, skew and jitter of a typical receiver. To accomplish the optical injection we designed small silicon detectors along-side standard 0.25micrometers CMOS-circuits. Due to the low intrinsic capacitance of the detectors, the photogenerated carriers can directly generate voltage swings that are comparable with CMOS voltage levels if the detectors are loaded with high-impedance circuits. As a first step to implement this scheme we characterized various detectors built in the CMOS process for their high-frequency response. In a test set-up the silicon detectors are sampled with on-chip samplers that only present a small capacitive loading to the detector node. We present the high-frequency high-impedance response measured with this scheme together with capacitance measurements and DC responsivities of various types and sizes of detectors. The characterized long tails typically observed with silicon detectors allowed us to set up a model for the power penalty we have to take into account for precise clock detection. Finally, as a proof-of-principle demonstration we present the first results of this receiverless scheme in which a totem-pole of silicon detectors directly drives an on-chip CMOS inverter.

Paper Details

Date Published: 27 March 2002
PDF: 11 pages
Proc. SPIE 4654, Silicon-based and Hybrid Optoelectronics IV, (27 March 2002); doi: 10.1117/12.463842
Show Author Affiliations
Christof Debaes, Vrije Univ. Brussel (Belgium)
Diwakar Argawal, Stanford Univ. (United States)
Aparna Bhatnagar, Stanford Univ. (United States)
Hugo Thienpont, Vrije Univ. Brussel (Belgium)
David A. B. Miller, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 4654:
Silicon-based and Hybrid Optoelectronics IV
David J. Robbins; Ghassan E. Jabbour, Editor(s)

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