Noise canceling technique for frequency synthesizer
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United States of America Patent
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Feb 2, 2010
Grant Date -
Nov 20, 2008
app pub date -
May 15, 2007
filing date -
May 15, 2007
priority date (Note) -
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Abstract
A frequency synthesizer is disclosed. According to one embodiment, the frequency synthesizer includes an input terminal and an output terminal, a loop filter, a digital phase detector, and an analog phase detector. The digital phase detector includes a first input coupled to the input terminal, a second input coupled to the output terminal, and an output coupled to the loop filter, the digital phase detector is configured to operate at a first phase comparison frequency. The analog phase detector includes a first input coupled to the input terminal, a second input coupled to the output terminal, and an output alternating current (AC) coupled to the loop filter, the analog phase detector is configured to operate at a second phase comparison frequency. The first phase comparison frequency is different from the second phase comparison frequency.
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