Direct conversion FM receiver with offset

Details Direct conversion FM receiver with offset Direct conversion FM receiver with offset

1988-08-09

1990-07-24

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455209, 455264, 455316, 329323, H04B 116, H03D 318

Patent

active

049440250

ABSTRACT:
A direct conversion FM receiver that includes AC coupling and automatic gain control employs an offset frequency at the first local oscillator. The offset frequency prevents the frequency spectrum occupied by the signal modulation from being affected by AC coupling. The offset frequency is chosen so that it translates the frequency spectrum of the received signal outside the DC notch created in the spectrum by the AC coupling. To conserve battery supplied power, an error amplifier coupled between the output of the receiver and the first local oscillator maintains the offset frequency after it has been established by a frequency synthesizer, which is then turned off.

REFERENCES:
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patent: 4677690 (1987-06-01), Reed
patent: 4736390 (1988-04-01), Ward et al.
"Solid State Radio Engineering," Krauss et al., 1980, pp. 26-30.

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