Importance

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Abstract

A clock circuit includes a set of level shifters, a duty cycle adjustment circuit and a calibration circuit. The set of level shifters configured to output a first set of phase clock signals having a first duty cycle. The duty cycle adjustment circuit is configured to generate a first clock output signal responsive to a multiplexed selection signal, the first clock output signal having a second duty cycle; and adjust the second duty cycle responsive to at least a set of control signals or a phase difference between a first and second phase clock signal. The calibration circuit is configured to perform a duty cycle calibration of the second duty cycle based on an input duty cycle, and to generate the set of control signals responsive to the duty cycle calibration of the second duty cycle.

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First Claim