Pipelined serial-parallel A/D converter

Details Pipelined serial-parallel A/D converter Pipelined serial-parallel A/D converter

1988-03-02

1990-01-09

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341172, H03M 114

Patent

active

048931241

ABSTRACT:
An A/D converter of this invention includes a first A/D converter for A/D-converting the input signal and determining upper bits of the n-bit binary code, first and second sample-hold circuits, which are alternately switched each time the first A/D converter samples the analog input signal, for sampling and holding the analog input signal, in synchronism with a sampling timing of the first A/D converter, and a second A/D converter. The second A/D converter is constituted by a reference voltage generator for generating reference voltages, based on contents of the binary code obtained by the first A/D converter, a voltage comparator for comparing the reference voltage with a voltage value of the analog input signal held in one of the first and second sample-hold circuits, which sample and hold the analog input signal corresponding to the binary code, and an encoder for encoding a comparison result output from the voltage comparator and determining lower bits of the n bits.

REFERENCES:
patent: 4008468 (1977-02-01), Imhoff et al.
patent: 4326192 (1982-04-01), Merrill et al.
patent: 4392124 (1983-07-01), Benoit-Gonin et al.
patent: 4745393 (1988-05-01), Tsukada et al.
Dingwall et al., "An 8-MHz CMOS Subranging 8-Bit A/D Converter," IEEE Journal of Solid-State Circuits, vol. SC-20, No. 6, pp. 1138-1143, Dec. 1985.

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