Radio having a combined PLL and AFC loop and method of operating

Details Radio having a combined PLL and AFC loop and method of operating Radio having a combined PLL and AFC loop and method of operating

1995-04-05

1997-05-13

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4551961, 455260, 455265, H04B 116

Patent

active

056302150

ABSTRACT:
A radio (100) has a combined phase locked loop (PLL) (207) and an automatic frequency control (AFC) loop (215, 109, 111) and a method of operating the same. A mixer (201) converts the received RF signal (117) to an intermediate frequency (IF) signal (219) responsive to an injection signal (217). The PLL (207) locks the injection signal (217) to the received RF signal (117) responsive to a difference between the IF signal (219) and a reference signal (119). The AFC loop (215, 109, 111) locks the reference signal (119) to the received RF signal (117) responsive to a difference between the injection signal (217) and the reference signal (119).

REFERENCES:
patent: 4542533 (1985-09-01), Parker
patent: 4703520 (1987-10-01), Rozanski, Jr. et al.
patent: 4709406 (1987-11-01), Omoto
patent: 5079526 (1992-01-01), Heck
patent: 5335364 (1994-08-01), Heinonen

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