Gain control circuit and method
US5812029A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 4, 1996 |
| Grant date | Sep 22, 1998 |
| Priority date | — |
| Expiry date | Oct 4, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G1/0082
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit and method for controlling current gain in variable gain and automatic gain control amplifiers or attenuators in high frequency communication systems. A transistor through which the current is provided always operates at the same DC bias, independent of gain control variations. The input signal is provided to a base of the transistor whose collector provides an output current whose gain is to be controlled. An AGC current for adjusting the output current gain and a DC bias current are provided to the base of the transistor through a multi-transistor circuit so that the DC bias is independent of variation of the output current gain.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.