Plural phase-lock loops sharing a common frequency control

Details Plural phase-lock loops sharing a common frequency control Plural phase-lock loops sharing a common frequency control

1990-04-20

1992-08-11

Pascal, Robert J.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 17, 331 46, H03L 700

Patent

active

051382822

ABSTRACT:
A magnetic tape readback system is disclosed for a multi-track tape player. A single phase lock loop is provided for the channel circuits used for reading signals from the respective tracks on a multi-track tape. A common frequency determining circuit means is coupled to all of the phase lock loops such that the frequency of operation of the phase lock loops is stabilized. A capacitor which has a capacitance usable in the individual phase lock loops for determining a frequency of operation is commonly AC connected to all of the phase lock loops; in this arrangement none of the phase lock loops have the frequency determining capacitor. A capacitance AC couples and DC blocks each of the individual phase lock loops to the frequency determining capacitor such that the individual phase lock loops have their own reference DC levels and yet receive AC input from all of the other phase lock loops.

REFERENCES:
patent: 4433424 (1984-02-01), Taber et al.
patent: 4470082 (1984-09-01), Van Pelt et al.
IBM Technical Disclosure Bulletin, vol. 14, No. 3, "Frequency Sychronization of Dead Tracked VFC's", Aug. 1971.

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