Phase locked loop tuning system including a prescaler...

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

H - Electricity

03

J

365/5

H03J 5/00 (2006.01) H03J 5/02 (2006.01) H03L 7/193 (2006.01)

Patent

CA 1175491

RCA 77,180 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.

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