Accurate charge-dividing digital-to-analog converter

Details Accurate charge-dividing digital-to-analog converter Accurate charge-dividing digital-to-analog converter

1997-10-22

1999-07-13

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341144, H03M 166

Patent

active

059232757

ABSTRACT:
A structure and a method are provided to convert the value of a digital word to an analog signal representing that value, using a small and simple charge divide-by-four circuit with one op amp. The D/A converter thus provided greatly reduces the effects of capacitor mismatch. The D/A converter processes one bit pair at a time and stores a corresponding charge. This charge is divided by four prior to processing the next bit pair. In one embodiment, the D/A converter has one operational amplifier, two capacitors, and seven switches. In another embodiment, the same number of elements are used in a different configuration, which allows an offset correction to be performed. In yet another embodiment, the D/A converter has one op amp, four capacitors, and eleven switches, which allows both offset voltage and gain compensation correction.

REFERENCES:
patent: 4523179 (1985-06-01), Kapral
patent: 4746903 (1988-05-01), Czarniak et al.
patent: 4905006 (1990-02-01), Pelgrom
patent: 5453757 (1995-09-01), Date et al.
patent: 5696509 (1997-12-01), Maejima
patent: 5781139 (1998-07-01), Weisbrod

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