Patent ID: 7602876

Claim:
A phase detector for detecting a phase relationship between a first clock signal and a second clock signal, the phase detector comprising: a first phase detector circuit configured to output a first signal having a first logic level during a time between the rising edge of the second clock signal and the falling edge of the first clock signal; a second phase detector circuit configured to output a second signal having the first logic level during a time between the falling edge of the second clock signal and the rising edge of the first clock signal; a charge pump circuit comprising: current driving circuitry configured to output current having a first polarity when the first and second output signals both have the first logic level and a second polarity when the first and second output signals both have a second logic level; a compensation circuit coupled to the current driving circuitry, the compensation circuit configured to at least partially compensate for differences in the current driving circuitry between outputting current having the first polarity and outputting current having the second polarity.