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Describes a technique for performing A/D conversion compatibly with standard single-channel MOS technology. The use of a binary weighted capacitor array to perform a high-speed, successive approximation conversion is discussed. The technique provides an inherent sample/hold function and can accept both polarities of inputs with a single positive reference. The factors limiting the accuracy and conversion rate of the technique are considered analytically. Experimental results from a monolithic prototype are presented; a resolution of 10 bits was achieved with a conversion time of 23 /spl mu/s. The estimated die size for a completely monolithic version is 8000 mil/SUP 2/.
Date of Publication: Dec. 1975