Patent ID: 8400227

Claim:
A clock generator, comprising: a current generator, for generating a first current according to a bias signal; an oscillator, coupled to the current generator, for generating a clock signal according to the first current; a frequency detector, coupled to the oscillator, for detecting the clock signal and a reference clock signal to output a first control signal; and a bias voltage adjuster, coupled between the current generator and the frequency detector, for outputting the bias signal according to the first control signal; wherein when the frequency of the clock signal changed, the bias voltage adjuster correspondingly adjusts the bias signal so that the current generator changes the first current; wherein the current generator comprises: a frequency to voltage converter, coupled to the current generator, for outputting a converted voltage according to a second current generated by the current generator and the clock signal; and a comparator, coupled to the frequency to voltage converter and the current generator, for outputting a feedback signal to the current generator according to the converted voltage and the bias signal.