Variable gain control circuit for a receiver and method therefor
US6400218B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 29, 2000 |
| Grant date | Jun 4, 2002 |
| Priority date | — |
| Expiry date | Feb 29, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2210/023
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A variable gain control circuit (125, 127) includes a programmable operational transconductance amplifier (OTA) circuit (214) and a programmable conveying circuit (544). The conveying circuit (544) has a programmable differential circuit (550) interconnected to a pair of programming inputs (564, 566). The pair of programming inputs (564, 566) is interconnected to a pair of programming inputs (238, 240) that set the gain of the OTA circuit (214). When the OTA circuit (214) is configured as an operational transconductance filter (112, 113), the programmable differential circuit (550) can adjust the gain of the conveying circuit (544) to compensate for changes in the input impedance of the filter (112, 113). The programming inputs (238, 240) that set the input impedance and bandwidth of the filter (113, 113) also control the amount of signal current transmitted by the conveying circuit (544).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.