Digital duty cycle correction

摘要

A digital duty-cycle correction circuit may include an adjustment unit that may be configured to adjust a duty cycle of an oscillating signal based on an adjust signal to generate an adjusted oscillating signal and a sampling unit that may be configured to sample the adjusted oscillating signal. The circuit may also include a counting unit that may be configured to generate an indication of a number of samples of the adjusted oscillating signal that are at the low and high level and to adjust the indication using a selectable duty cycle modify signal based on a desired duty cycle of the adjusting oscillating signal. The circuit may also include a comparing and filtering unit that may be configured to generate the adjust signal based on a comparison of the indication with a comparison count. The indication may be adjustable such that the oscillating signal's duty cycle is adjustable.

主权项

1. A digital duty-cycle correction circuit comprising:
an adjustment unit configured to adjust a duty cycle of an oscillating signal based on an adjust signal to generate an adjusted oscillating signal, the oscillating signal configured to oscillate between a low level and a high level; a sampling unit configured to sample the adjusted oscillating signal; a counting unit configured to generate an indication of a number of samples of the adjusted oscillating signal that are at the low level and a number of samples of the adjusted oscillating signal that are at the high level and to adjust the indication using a selectable duty cycle modify signal based on a desired duty cycle of the adjusted oscillating signal such that the duty cycle of the oscillating signal is adjustable to more than one value; and a comparing and filtering unit configured to generate the adjust signal based on a comparison of the indication with a comparison count.