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

Abstract From the Canadian patent

A digital-to-analog (D/A) converter is disclosed for converting an n-bit digital signal represented by a 2's complement into an analog signal. The converter comprises a capacitor array comprising (n-1) capacitors each being weighted by a 2's power and commonly connected at one electrode to a common output terminal; control means for producing first, second and third control signals from an operation clock and the digital signal; and a switch array comprising (n-1) switches connected one-to-one to the other electrode of the (n-1) capacitors for applying either one of a first and a second reference voltage to the (n-1) capacitors in response to the second control signal. An additional …