Analog circuit for simulating a digitally controlled rheostat
US4644193A · kind A · utility
3Cited by
9References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 4, 1984 |
| Grant date | Feb 17, 1987 |
| Priority date | — |
| Expiry date | Apr 4, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06J1/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.