A/D converter with interpolation

Details A/D converter with interpolation A/D converter with interpolation

1996-12-12

1998-09-08

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341159, H03M 114

Patent

active

058050965

ABSTRACT:
An A/D converter in which an interpolation circuit (15, 16, 17, 18) makes weighted combinations of reference crossing signals (A/Ac,B/Bc) provided by an input circuit (100, 200), so as to obtain an expanded set of reference crossing signals (A/Ac+A1/Ac1 . . . A7/Ac7, B/Bc+B1/Bc1 . . . Bc7). The interpolation circuit (15, 16, 17, 18) is arranged to make at least one weighted combination of reference crossing signals with weighting factors which have a non-integer ratio so as to compensate for a non-linearity in the reference crossing signals (A/Ac,B/Bc). Accordingly, a better compromise is obtained between accuracy, on the one hand, and circuit complexity, on the other hand.

REFERENCES:
patent: 4430736 (1984-02-01), Scholz
patent: 4831379 (1989-05-01), van de Plassche
patent: 5497155 (1996-03-01), Izuhara

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