Mixer dynamic control

Details Mixer dynamic control Mixer dynamic control

1988-03-31

1989-10-03

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455246, 455251, H04B 126

Patent

active

048722065

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.

REFERENCES:
patent: 3495244 (1970-02-01), La Rosa
patent: 3665317 (1972-05-01), Crow
patent: 4121161 (1978-10-01), Ohsawa
patent: 4455681 (1984-01-01), Wile
patent: 4538300 (1985-08-01), Richards, Jr.
patent: 4580288 (1986-04-01), Rinderle
patent: 4776040 (1988-10-01), Ichikawa et al.

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