Differential charge pump for a phase locked loop
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United States of America Patent
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Sep 25, 1990
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N/A
app pub date -
Feb 16, 1989
filing date -
Feb 16, 1989
priority date (Note) -
Expired
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Abstract
A differential charge pump for use in a phase locked loop. The charge pump generates a voltage difference signal proportional to the duration of first and second pulse trains provided by a phase comparator. The charge pump includes a differential amplifier for generating the difference signal, first and second RC filter networks connected between the noninverting and inverting terminals of the differential amplifier and a reference node, respectively. Parallel, all-NPN switching networks apply charging current pulses to the first RC filter network in response to the first pulse train and they apply charging current pulses to the second RC filter network in response to the second pulse train.
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