Phase lock loop system including a primary phase lock loop apparatus and a high order phase lock loop apparatus
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United States of America Patent
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Sep 8, 1998
Grant Date -
N/A
app pub date -
Sep 29, 1995
filing date -
Oct 4, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A phase lock loop system includes: a phase detecting circuit which operates on the basis of a signal waveform; a current output circuit for generating a current value from a phase difference detected by the phase detecting circuit; a filter which is constructed by only a resistor in a phase locked state by a synchronizing signal and by a capacitor and the resistor upon phase following state; and a voltage controlled oscillator for controlling an oscillation frequency by a voltage output of the filter. The phase lock loop system operates as a primary phase lock loop circuit in the phase locked state by the synchronizing signal and operates as a secondary phase lock loop circuit upon phase following state.
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