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We propose behavioral time-domain modeling for a Sigma-Delta Modulator (ΣΔM) to sense photocurrent in a CMOS Image Sensor (CIS). The model starts from transfer function for first-order single-bit ΣΔM in discrete-time, and then adds noise sources and nonlinearities by introducing noise floor and harmonic distortion, which determine system performance. The results were compared with the measurements...
The system-on-chip of study is a proposed CMOS Image Sensor (CIS) architecture which includes: passive pixel array, digital switches for rows/columns and a first-order single-bit Sigma-Delta Modulator for every four columns. This paper presents the behavioral model of the Sigma-Delta Modulator, to estimate their performance in terms of Signal to Noise Ratio and Dynamic Range. The model starts with...
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