Digitized AGC amplifier with gain hysteresis circuit
US4066977A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1976 |
| Grant date | Jan 3, 1978 |
| Priority date | — |
| Expiry date | Mar 30, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/30
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A digitized automatic gain controlled amplifier and gain hysteresis circuit is disclosed for preserving a low frequency, low level modulation at the output of an AGC amplifier while also providing for rapid correction of amplifier gain for large variations in the amplifier input signal level. The described amplifier is particularly adapted to satellite communications systems in which ionospheric changes produce rapid power fades and wherein satellite tracking is accomplished by dithering a high-gain antenna on the satellite to produce a low-frequency power amplitude control signal at the input to the AGC amplifier, which control signal is allowed to pass through to a control system while the larger input signal variations are gain-controlled out.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.