Automatic gain control circuit for signal with diverse power level range
US6420934B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 2000 |
| Grant date | Jul 16, 2002 |
| Priority date | — |
| Expiry date | Aug 24, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/3036
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An automatic gain control circuit for amplifying an input signal of varying strength and having a fast attack mode of operation and a tracking mode of operation includes a gain controlled amplifier for receiving the input signal and producing an amplified analog output signal, a receive signal strength indicator (RSSI) circuit for receiving the amplified analog signal and producing an output voltage indicative of strength of the signal, and decision logic circuitry responsive to the output voltage from the RSSI circuit for controlling gain to the gain controlled amplifier. A plurality of comparators is provided for comparing the output voltage from the RSSI circuit to threshold voltages in generating output signals indicative of the voltage comparisons which can indicate the RSSI output voltage being very low, low, high, or very high as inputs to the decision logic circuit. The decision logic circuitry can then provide a fast acquisition mode of operation or a tracking mode of operation depending on the output signals from the plurality of comparators. In preferred embodiments, the gain controlled amplifier can comprise a plurality of cascaded gain controlled amplifier circuits wit…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.