RF receiver using if amplifier operative during low level recept

Details RF receiver using if amplifier operative during low level recept RF receiver using if amplifier operative during low level recept

1994-12-27

1997-10-14

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

With protection circuit for receiver circuit

4552351, 4552501, 455254, 455266, 455341, H04B 116

Patent

active

056782144

ABSTRACT:
In a radio-frequency receiver, a received RF signal is converted to an intermediate frequency (IF) signal and band-limited by a first IF filter to a channel bandwidth. The level of the output of the IF filter is detected by a detector and compared with a threshold to produce a first and a second output when the detected level is lower or higher than the threshold, respectively. A switching circuit applies the output of the IF filter to a demodulator via an IF amplifier in response to the first output and directly applies it to the demodulator in response to the second output. To prevent interference from adjacent channels, a second intermediate frequency filter is connected between the band-limiting IF filter and the detector. The second IF filter has a passband corresponding to a center frequency portion of the passband of the band-limiting IF filter.

REFERENCES:
patent: 5230096 (1993-07-01), Davies
patent: 5241697 (1993-08-01), Hansen

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