Graduate Thesis Or Dissertation
 

MOSFET-only predictive track and hold circuit

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/6t053k32v

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  • High-accuracy and high-speed CMOS track-and-hold (T/H) or sample-and-hold (S/H) circuits are an important part of the analog-to-digital interface. The switched-capacitor (SC) circuits usually contain one or more op-amps whose dc offset, finite gain, finite bandwidth have a big impact on the accuracy of the track-and-hold circuit. Basic correlated double sampling (CDS) scheme can reduce such effects, but the compensation that it provides may not be good enough for high-accuracy application. Also, the high-quality analog poly-poly capacitors used in most SC circuits are not available in a basic digital CMOS process. The MOSFET-only predictive track-and-hold circuit, discussed in this thesis, replaces the poly-poly capacitors with easily-available low-cost area-saving MOSFET capacitors biased in accumulation region. It also uses the predictive correlated double sampling (CDS) scheme, in which the op-amp predicts its output for the next clock period during the present clock period, so that the adjacent two output samples are nearly the same. The predictive operation results in more correlation between the unwanted signal and the signal that is subtracted during the double sampling, and hence can achieve offset and gain compensation over wider frequency range. Hence, this circuit is suitable for high-accuracy applications, while using only a basic digital process.
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