Daniel H Carson

US Patent:

54020824, Mar 28, 1995

Filed:

Jul 14, 1994

Appl. No.:

8/276067

Inventors:

Larry E. Eccleston - Edmonds WA
Daniel B. Carson - Bothell WA

Assignee:

Fluke Corporation - Everett WA

International Classification:

H02J 500

US Classification:

327530

Abstract:

A voltage and resistance synthesizer includes a pulse width modulator (PWM) for synthesizing voltage and resistance values at a pair of terminals. A selector switch selects between a resistance synthesis mode, in which resistance values are synthesized from a single reference resistor, and a voltage synthesis mode, in which voltage values are synthesized from a single reference voltage. The pulse width modulator permits digital control words to be received which govern the synthesized value with 16 bit resolution. A low pass filter blocks the switching frequency components and provides a d. c. voltage which is the product of the duty cycle and the reference value.