Title: Digital to analog converter with complementary true current outputs

Abstract: A digital to analog converter is disclosed wherein two current outputs are provided, one the complement of the other. The digital to analog converter includes a novel two branched, symmetric, transistor switching circuit as well as an improved electrical n-bit weighting network which has ports for communicating weighted signal segments to connected transistor switching circuits. Logic inputs to the switching circuits determine whether an output signal is to be supplied in a first output summing line or a second, complementary, output summing line, both of which have high output impedance and high output voltage compliance which defines true current output.

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Inventors: Schoeff, John A. (Los Gatos, CA, US)

Application Number: 646766
Filing Date: 1976-01-06
Publication_date: 1978-05-30
Assignee: Precision Monolithics, Inc. (Santa Clara, CA)
Primary Class(es): 341/154
Other Classes:
US Patent Ref:

3544994	Dec, 1970	Hanson et al.	340/347.
3832707	Aug, 1974	Buchanan et al.	340/347.
3842412	Oct, 1974	Spottord	340/347.
3940760	Feb, 1976	Brokaw	340/347.
3961326	Jun, 1976	Craven	307/244.

Other Refs:
Primary Examiner: Sloyan, Thomas J.
Assistant Examiner:
Attorney: