Digital controlled amplifier
US4542349A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 10, 1984 |
| Grant date | Sep 17, 1985 |
| Priority date | — |
| Expiry date | Feb 10, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/001
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A digital control amplifier is provided as a unitary monolithic device to control the transfer function of an analog signal in response to a digital control, such as from a digital computer. A current transfer cell is employed which uses an amplifier circuit having transistors of like polarity, and is capable of both attenuation and greater than unity amplification of an input analog signal. A digital-two-analog converter is integrated into the system and employs a series of current dividers which enables a common reference current to be used for each bit of the converter. A current reference circuit for the converter employs a band gap voltage regulator with a temperature compensation design that varies the control signal applied to the current transfer cell to compensate for temperature-induced variations in the output of the cell.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.