Radio receiver having phase locked loop frequency synthesizer

Details Radio receiver having phase locked loop frequency synthesizer Radio receiver having phase locked loop frequency synthesizer

1980-07-01

1982-07-13

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

331 22, 331 31, 455165, H04B 126, H03J 728, H03L 718

Patent

active

043398260

ABSTRACT:
A radio receiver comprises a frequency conversion circuit connected between a frequency-variable local oscillator and a divide-by-N programmable counter incorporated in a phase locked loop frequency synthesizer and adapted to continuously change the frequency to be divided by the programmable counter. Owing to the frequency conversion circuit, the local oscillator frequency is permitted to continuously change in the locked state of the phase locked loop so that the intermediate frequency offset adjustment of receivers, that is, the adjustment of the intermediate frequency of each receiver to the center frequency of an intermediate frequency filter used in the receiver can be made easily, and that a reception of such a broadcast station as having a carrier frequency which is not an integral multiple of a channel spacing frequency also can be made.

REFERENCES:
patent: 4097805 (1978-06-01), Fujii et al.
patent: 4223406 (1980-09-01), Someno

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