Clock duty cycle measurement with charge pump without using reference clock calibration
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United States of America Patent
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Oct 18, 2011
Grant Date -
Dec 31, 2009
app pub date -
Jun 27, 2008
filing date -
Jun 27, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Embodiments of the disclosure provide systems and methods for clock duty cycle measurement. A clock signal and a complement of the clock signal are provided to a charge pump during first and second predetermined timing windows. A charge pump is operable to generate first and second output voltages in response to the clock signal and the complement of the clock signal during the first and second timing windows, respectively. In addition a predetermined positive voltage and a ground voltage are applied to the charge pump during predetermined third and fourth timing windows, respectively. The charge pump is operable to generate third and fourth output voltage signals corresponding to the predetermined positive and ground voltages during the third and fourth timing windows, respectively. The first, second, third and fourth voltages are then used to calculate the duty cycle of the clock.
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