Tuning circuit using a phase-locked loop

Details Tuning circuit using a phase-locked loop Tuning circuit using a phase-locked loop

1979-12-07

1981-12-08

Orsino, Jr., Joseph A.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455182, 455164, 455260, 3581951, H04B 132

Patent

active

043051570

ABSTRACT:
A tuning apparatus includes an RF amplifier for receiving a video signal corresponding to a selected channel, a voltage controlled oscillator for producing a local oscillation signal, a mixing circuit for converting the received video signal to an intermediate frequency signal with the local oscillation signal, a programmable frequency divider selectively receiving the local oscillation signal and the intermediate frequency signal and producing a frequency-divided output signal, a phase comparator for comparing the frequency-divided output signal with a reference oscillation signal so as to control the voltage controlled oscillator, a switching circuit for selectively supplying the local oscillation signal and the intermediate frequency signal to the programmable frequency divider, and a control circuit for selectively enabling the switching circuit to supply the local oscillation signal to the programmable frequency divider during a predetermined time after the channel is selected and to supply the intermediate frequency signal after the predetermined time, the control circuit also controlling the RF amplifier and the voltage controlled oscillator in accordance with a frequency band containing the selected channel.

REFERENCES:
patent: 4081752 (1978-03-01), Sumi
patent: 4088959 (1978-05-01), Sumi
patent: 4110694 (1978-08-01), Wilhelm
patent: 4128849 (1978-12-01), Rhee

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