Phase detector using switched capacitors
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United States of America Patent
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Jan 11, 2000
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N/A
app pub date -
Feb 19, 1998
filing date -
Feb 19, 1998
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Abstract
A phase detector operating in a low voltage environment and providing a substantially constant integral voltage over variations in temperature, supply voltage and process parameters. The quadrature phase detector includes an equalizer, a switching unit, a sampler and comparator unit and a bias generator. The bias generator includes a switched capacitor structure which produces a bias current which tracks fluctuations in capacitance values due to temperature, supply voltage and process variations. The errors introduced due to fluctuations in bias current and capacitance are thus minimized.
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