FM-Receiver using a ratio detector with silicon diodes

Details FM-Receiver using a ratio detector with silicon diodes FM-Receiver using a ratio detector with silicon diodes

1982-10-18

1985-02-12

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455214, 455311, 329130, H04B 116

Patent

active

044996055

ABSTRACT:
An FM-receiver having an FM-channel successively comprising an RF-input stage and mixer stage (B), an IF-circuit (A) and a ratio detector (R). The ratio detector incorporates silicon detector diodes and a smoothing capacitor conductively connected to the detector diodes for a dynamic amplitude limitation of the ratio detector output signal in dependence on the amplitude of the ratio detector input signal. A bias voltage is applied to the silicon diodes to prevent the silicon diodes from being blocked at signals lower than the threshold voltage of the diodes. The bias voltage comprises an average noise voltage that is generated by amplifying a noise component of the FM signal, the noise component being present in the IF bandwidth. The average noise voltage is predominantly obtained by amplifying the noise produced within the IF-passband of the IF-input stage.

REFERENCES:
patent: 2501077 (1950-03-01), Murakami
patent: 3588721 (1971-06-01), Keller
patent: 3633134 (1972-01-01), Barrows
patent: 4225975 (1980-09-01), Iwamoto

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