Accession Number:

ADD012765

Title:

Analog Circuit for Simulating a Digitally Controlled Rheostat.

Descriptive Note:

Patent,

Corporate Author:

DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s):

Report Date:

1987-02-17

Pagination or Media Count:

7.0

Abstract:

The simulation of a two-wire rheostat is accomplished by an analog output circuit whose value is digitally controlled. It comprises a four-quadrant multiplying digital to analog converter MDAC and a current booster including active elements in the feedback loop of an amplifier. The digital rheostat acts as a variable resistance whose value is controlled by a digital controller and can accommodate either AC or DC excitations. The unit forms a negative feedback loop containing only solid-state devices and relies on fixed resistors for accuracy.

Subject Categories:

  • Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE