A 12b successive-approximation A/D converter has been implemented in a standard metal-gate NMOS process. Monotonicity to 12b (differential nonlinearity less than l / 2 LBS) is attained with only 8b accurate ratio matching of circuit elements, due to the circuit configuration used. Since MOS weighted-capacitor arrays can achieve this accuracy as fabricated', no trimming or adjustments are required to assure monotonicity-. .4pplications for this type of converter are found in closed-loop control systems and dig…
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