D/A converter

Details D/A converter D/A converter

1988-08-24

1989-06-27

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341145, 341146, 341153, H03M 180

Patent

active

048433934

ABSTRACT:
A D/A converter includes a first stage capacitor ladder, a second stage capacitor ladder, a coupling capacitor, (l+m) switches, and a short-circuiting switch. The first stage capacitor ladder includes l capacitors having one side electrodes commonly connected to a first point and capacitances binary-increased from 2.sup.0.C to 2.sup.l-1.C (l is a natural number and C is a unit capacitance). The second stage capacitor ladder includes m capacitors having one side electrodes commonly connected to a second point and capacitances binary-increased from 2.sup.0.C to 2.sup.m-1.C (m is a natural number). The coupling capacitor has a capacitance of 1.C and is connected between the first and second points. The (l+m) switches selectively connects another side electrodes of the (l+m) capacitors to a first or second reference voltage in response to an (l+m)-bit digital input signal. The short-circuiting switch is connected between the first reference voltage and the first point of the first stage capacitor ladder.

REFERENCES:
patent: 4077035 (1978-02-01), Yee
patent: 4611195 (1986-09-01), Shosaku
"Integrated PCM Codec", Reprinted from IEEE J. Solid-State Circuits, vol. SC-14, pp. 38-46, Feb. 1979.

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