Phase locked loop comprising a variable delay and a discrete delay

摘要

the phase locked loop circuit for providing an oscillating output signal having an output frequency , a reference counter; Loop counter; A phase detector having a second input coupled to the first input coupled to the reference counter and the loop counter ; Associated with the input and output of the phase detector , a voltage controlled oscillator having an output for providing an oscillating output signal; A feedback loop to the output of the voltage controlled oscillator connected to the input of the loop counter ; And a feedback loop, and a loop counter and / or a delay circuit configured so that the discrete delay results in the output of the reference counter .