FREQUENCY COMPARATOR, FREQUENCY SYNTHESIZER, AND RELATED METHODS THEREOF
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United States of America Patent
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Issued Date -
May 29, 2008
app pub date -
Dec 3, 2006
filing date -
Sep 20, 2006
priority date (Note) -
Abandoned
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Abstract
The present invention discloses a frequency comparator for comparing frequencies of a first signal and a second signal. The frequency comparator includes: a frequency detecting circuit for generating a reference signal according to the first signal and an input voltage; a frequency generator for generating the second signal according to the input voltage; a charge pump circuit for enabling a charging current according to either the reference signal or the second signal to increase an voltage level, and for enabling a discharging current according to the other signal to decrease the voltage level; and a decision logic coupled to the charge pump circuit for indicating a frequency relation between frequencies of the first signal and the second signal according to the voltage level.
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