Differental D/A converter with N-bits plus sign

Details Differental D/A converter with N-bits plus sign Differental D/A converter with N-bits plus sign

1995-07-21

1997-11-18

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341145, H03M 166

Patent

active

056892594

ABSTRACT:
The present invention provides a digital-to-analog converter which uses two separate digital-to-analog converters for the first N-bits. The N+1 bit, which is the sign bit in a sign and magnitude digital format, is used to provide the difference between the two digital-to-analog converters to the output for a first value, and to switch the DAC outputs for a second value of the sign bit. The present invention thus eliminates the parasitic capacitance of the N+1 bit by using a differential input which is switched depending on the sign bit.

REFERENCES:
patent: 3582941 (1971-06-01), Le Maout et al.
patent: 4430642 (1984-02-01), Weigand et al.
patent: 4473818 (1984-09-01), Youngquist
patent: 4488144 (1984-12-01), Wollman
patent: 5257027 (1993-10-01), Murota
patent: 5376936 (1994-12-01), Kerth et al.
patent: 5389928 (1995-02-01), Coppero et al.
patent: 5394146 (1995-02-01), Arimoto et al.

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