Patent ID: 7019574

Claim:
A circuit for correction of the duty cycle value of a digital data signal, comprising: a duty cycle correction device which has the data signal coupled to a signal input, and operable to correct the duty cycle value of the data signal as a function of a digital control signal which is applied to a control input of the duty cycle correction device, and output a corrected data signal at a signal output; and a digital duty cycle detector connected between the signal output and the control input of the duty cycle correction device, and operable to determine the actual duty cycle value of the corrected data signal and produce the digital control signal for the duty cycle correction device such that a discrepancy between the actual duty cycle value and a predetermined duty cycle value is a minimum, wherein the duty cycle detector comprises: a digital integrator for forming the digital control signal; and a digital averaging circuit operable to determine a time at which an output signal of the digital integrator is used to form and update the digital control signal, and comprising a signal edge counter that counts the signal edges of the corrected data signal and triggers a production of the digital control signal as a function of its count with a trigger signal.