Patent ID: 7706496

Claim:
A digital phase detector comprising: a phase/frequency detector, said phase/frequency detector being configured to receive a reference signal and a divided oscillator feedback signal and output a first pulse-width modulated signal and a second pulse-width modulated signal; a first time-to-digital converter, said first time-to-digital converter being coupled to an output of said phase/frequency detector; wherein said first time-to-digital converter is configured to receive and convert said first pulse-width modulated signal to a first digital number; a second time-to-digital converter coupled to an output of said phase/frequency detector, wherein said second time-to-digital converter is configured to receive and convert said second pulse-width modulated signal to a second digital number; and a summation element, wherein said summation element is configured to subtract said second digital number from said first digital number and output a digital phase error signal.