Phase locked loop tuning system including a prescaler conditione

Details Phase locked loop tuning system including a prescaler conditione Phase locked loop tuning system including a prescaler conditione

1981-06-05

1983-01-11

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455183, 455260, H03L 718, H04B 126

Patent

active

043685404

ABSTRACT:
In a phase locked loop tuning system including a prescaler for dividing the frequency of the local oscillator signal by a factor selected to make the resultant frequency divided signal compatible with digital processing portions of the tuning system, a frequency selective network is coupled to the prescaler to tune the self-oscillation frequency of the prescaler to a frequency not corresponding to the local oscillator frequency of any legitimate channel. In this manner, when a new channel is selected and the amplitude of the local oscillator signal is below the threshold at which the prescaler will respond to it, the phase locked loop will properly control the local oscillator, rather than respond to a self-oscillation signal which may otherwise correspond to the local oscillator frequency for the selected channel.

REFERENCES:
patent: 4110693 (1978-08-01), Evans
patent: 4127820 (1978-11-01), Beelitz et al.
patent: 4218657 (1980-08-01), Rast
patent: 4245350 (1981-01-01), Moore
patent: 4271531 (1981-06-01), Torii et al.
FIG. 19 on pp. 23-24 of "RCA Television Service Data for the CTC 111", file 1981, C-3.
"Data Sheet for the CA3163G" (RCA).

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