Mixer dynamic control
US4872206A · kind A · utility
12Cited by
7References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1988 |
| Grant date | Oct 3, 1989 |
| Priority date | — |
| Expiry date | Mar 31, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/348
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A mixer dynamic control (MDC) system for an AM superheterodyne receiver prevents saturation of the mixer stage caused by out-of-tune signals much more effectively than a so-called wide band RF-AGC system of the known art. The system contemplates detecting the converted IF signal before the band filter, amplifying the detected signal, extracting the dc component thereof and summing such a dc component to a dc control signal generated by a narrow band AGC and applying such a sum signal in lieu of the sole narrow band AGC system's control signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.