Variable gain amplifier circuit
US5424682A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 1994 |
| Grant date | Jun 13, 1995 |
| Priority date | — |
| Expiry date | Aug 1, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/3005
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A variable gain control circuit (10) provides an output signal having a gain dependent on first (34) and second (52) reference current sources. An amplifier circuit (14, 20) generates first and second dynamic control voltages that control current flow through an input stage (30) referenced to the first reference current source. The dynamic control voltages produce similar currents in an output stage (32) referenced to the second reference current source. The dynamic control voltages to the input and output stage allow the variable gain amplifier circuit to operate with low power supply potentials which is especially useful in battery applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.