Fine tuning frequency synthesizer with feedback loop for frequen

Details Fine tuning frequency synthesizer with feedback loop for frequen Fine tuning frequency synthesizer with feedback loop for frequen

1988-10-17

1990-12-11

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455192, 455260, 455296, 331 1A, H04B 126

Patent

active

049776134

ABSTRACT:
An additional mixer is included in the feedback loop of a PLL which can be one of the local oscillators of a dual conversion system. A fine tuning frequency synthesizer is coupled to an input of the additional mixer for providing fine frequency control of the PLL. The fine tuning frequency synthesizer can include an additional phase locked loop. Also, a feedback signal for suppressing noise created by another local oscillator can also be applied to the additional mixer.

REFERENCES:
patent: 4038689 (1977-07-01), Rzeszewski
patent: 4491976 (1985-01-01), Saitoh
patent: 4521916 (1985-06-01), Wine
patent: 4551856 (1985-11-01), Victor et al.
patent: 4625331 (1986-11-01), Richardson et al.
patent: 4703520 (1987-10-01), Rozanski, Jr.
patent: 4709406 (1987-11-01), Omoto

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