Phase-locked loop circuit and radio communication apparatus using the same
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United States of America Patent
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-
Nov 27, 2001
Grant Date -
Jul 19, 2001
app pub date -
Dec 6, 2000
filing date -
Jan 30, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
A communication apparatus includes a phase-locked loop circuit which receives a first signal having a frequency and converts the first signal into an output signal having a transmission frequency. The phase-locked loop circuit includes a current output type phase comparator which converts a phase difference between the first signal and a second signal into a current signal, a low pass filter which filters the current signal of the current output type phase comparator to produce an output signal, a voltage controlled oscillator which produces an output signal having a transmission frequency corresponding to the output signal of the low pass filter, the output signal of the voltage controlled oscillator constituting the output signal of the phase-locked loop circuit, and a frequency converter which frequency-converts the output signal of the voltage controlled oscillator to produce the second signal.
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