D/A converter for digital signals represented by a 2's complemen

Details D/A converter for digital signals represented by a 2's complemen D/A converter for digital signals represented by a 2's complemen

1989-03-14

1990-06-26

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341127, H03M 180

Patent

active

049375784

ABSTRACT:
A digital-to-analog (D/A) converter for converting a n-bit digital 2's complement signal to an analog signal. The D/A converter consists of a controller, a capacitor array, and a switch array. The controller operates to convert a 2's complement digital input signal into a 1's complement digital signal. The capacitor array consists of (n-1) capacitors each being connected at one electrode to a common output terminal. The switch array consists of (n-1) switches each connected individually to the remaining electrodes of the (n-1) capacitors. The switch array applies either one of a first or a second reference voltage to the (n-1) capacitors in response a second controller signal. An additional capacitor and switch are connected to the capacitor and switch arrays which serve to convert a digital signal from 2's complement to 1's complement. The additional switch, unlike the other switches, feeds either the first or second reference voltage to the additional capacitor in response to the first controller signal, or it feeds the first reference voltage in response to the third controller signal.

REFERENCES:
patent: 4763108 (1988-08-01), Kobayashi
patent: 4799042 (1989-01-01), Confalonieri et al.
patent: 4843393 (1989-06-01), Kuraishi

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