Variable clock phase generation method and system
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United States of America Patent
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Aug 8, 2017
Grant Date -
Aug 18, 2016
app pub date -
Feb 13, 2015
filing date -
Feb 13, 2015
priority date (Note) -
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Abstract
A variable phase generator is disclosed that includes a delay line with an input, and output, and a delay lone control signal input. A signal on the delay line output has a phase offset relative to the delay line input signal such that the phase offset is controlled by a digital offset signal. A phase detector process the input signal and the output signal to generate a phase detector output signal. A charge pump, responsive to the phase detector output signal, generates a charge pump output. A digital to analog converter receives and converts the digital offset signal to an analog offset signal. A control node is connected to the delay line control input, the charge pump, and the digital to analog converter, and is configured to receive and combine the charge pump output and the analog offset signal to create the delay line control signal.
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