Frequency synthesis tuning control system for a double-conversio

Details Frequency synthesis tuning control system for a double-conversio Frequency synthesis tuning control system for a double-conversio

1983-11-29

1985-06-04

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455260, 455316, 455183, 331 22, 331 25, H04B 126

Patent

active

045219168

ABSTRACT:
The tuning control system of a double-conversion tuner includes a phase locked loop type of frequency synthesizer for controlling the frequency of a controllable oscillator comprising the first local oscillator of the double-conversion tuner according to the frequency deviation of the difference between the frequencies of the first and second local oscillators from a reference frequency in order to compensate for the drift of either one of the local oscillators. An up/down counter which counts in one sense in response to the first local oscillator signal and in the other sense in response to the other local oscillator signal is used to generate the frequency difference signal. Because the frequency of the first local oscillator is always greater from the frequency of the second local oscillator the up/down counter can be implemented in the form of a simple pulse swallower.

REFERENCES:
patent: 2882394 (1959-04-01), Mortley
patent: 4152669 (1979-05-01), Igarashi
patent: 4184068 (1980-01-01), Washburn
patent: 4340974 (1982-07-01), Cooke et al.
patent: 4451930 (1984-05-01), Chapman et al.
"Frequency Stabilization of Communication Receivers" by Nield, Conference on Radio Receivers and Asso. Systems, 7-1978.
Past, Present and Future Trends of TV Tuner Design in Europe, by J. H. Schuermann, published in the IEEE Transactions on Consumer Electronics, May 1977.

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