Digital to analog converter using capacitors and switches for ch

Details Digital to analog converter using capacitors and switches for ch Digital to analog converter using capacitors and switches for ch

1996-07-26

1997-12-09

Gaffin, Jeffrey A.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341172, 341144, H03M 166

Patent

active

056965095

ABSTRACT:
A D/A converter is formed of a combination of switches and capacitors. A voltage source supplies a plurality of different predetermined voltages corresponding, respectively, to different logical levels of bit data of input digital data. A first switch device is connected to the voltage source for selecting the different predetermined voltages. A first capacitor is connected to the voltage source by way of the first switch device, and charged by the different voltages selected by the first switch device. A second capacitor is connected to the first capacitor by way of a second switch device, for carrying out distribution of charge between the first and second capacitors. A charge-to-voltage converter circuit is associated with the second capacitor, for converting charge from the second capacitor to voltage. A clock signal generator circuit generates clock signals for selectively driving the first and second switch devices, in synchronism with the bit data of the input digital data.

REFERENCES:
patent: 4896156 (1990-01-01), Garverick
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patent: 4999634 (1991-03-01), Brazdrum et al.
patent: 5134401 (1992-07-01), McCartney et al.
patent: 5159341 (1992-10-01), McCarney et al.
patent: 5177484 (1993-01-01), Bruckmann
patent: 5572107 (1996-11-01), Koch et al.
patent: 5581252 (1996-12-01), Thomas

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