A comparator circuit with a built-in programmablethreshold is proposed. The threshold is embedded by providing different initial source voltages to each of the input transistors. This source-voltage shifting is done ...
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A comparator circuit with a built-in programmablethreshold is proposed. The threshold is embedded by providing different initial source voltages to each of the input transistors. This source-voltage shifting is done by means of a tunable capacitance, which can synthesise a very widerange of initial voltages, even voltages beyond the supply. This results in a power-efficient comparator structure with a very wideprogrammabletuningrange and low decision delay. The inherently small integrating capacitance of the structure allows for high speed operation even when using small device sizes, minimising input capacitance and maximising efficiency. A practical transistor-level implementation is simulated in a standard 16 nm CMOS technology on a 0.8 V supply, with a tuningrange of at least +/- 568 mV.
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