Abstract
This paper presents analytical and experimental noise of a correlated double sampling (CDS) readout circuit used in CMOS active pixel image sensors. The work takes into account low frequency noise, mainly random telegraph signal (RTS) noise, in modern MOS transistors with very small geometries. The impact of the source-follower transistor noise power spectral density through CDS is studied. The results allow the determination of the output rms noise versus random telegraph signal noise characteristics. We show that R.T.S. noise of the source-follower is a major factor influencing the circuit output rms noise. Theoretical results are compared with experimental data
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