Sensitivity switching circuit for radio receiver

Details Sensitivity switching circuit for radio receiver Sensitivity switching circuit for radio receiver

1991-06-28

1994-01-18

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

4552491, 307529, H04B 110

Patent

active

052806430

ABSTRACT:
An RF signal received by an antenna is amplified in an amplifier circuit and is then tuned in a tuned circuit to pick up a signal having a certain frequency and a certain level. Then, the picked up signal is mixed with another signal to output an IF signal and the IF signal is detected to reproduce the desired broadcasting program. An AGC circuit ensures high and low levels of the received signal to make the received signal to a certain level. Further, a damping circuit capable of switching a damping amount by a sensitivity switching signal is arranged in the rear stage of the AGC circuit. Hence, intensity of a signal for performing a detection or the like can be exactly switched based of the sensitivity switching signal in an automatic broadcasting station selection.

REFERENCES:
patent: 4313218 (1982-01-01), O'Donnell, Jr.
patent: 4553105 (1985-11-01), Sasaki
"Automatic Input Attenuator For H.F. Communication Receivers", Radio and Electronic Engineer, vol. 47, No. 11, pp. 465-469, Oct. 1977.

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