Patent ID: 6429694
Filing Date: 2002-08-06
Classification: H03K,H03L

Abstract:
An apparatus in an integrated circuit formed on a substrate for detecting minute phase differences between clock signals, comprising:a coincidence circuit responsive to a first and slower second clock signals, wherein said coincidence circuit provides a first output signal in response to said first clock signal and a second output signal in response to both said first clock signal and said slower second clock signal wherein said first output signal and said second output signal are separated in time in response to differences in said first and slower second clock signals; a delay circuit responsive to said output signals provided by said coincidence circuit, wherein said delay circuit increases delays between said first and slower second clock signals; and a phase detector responsive to said delay circuit, wherein said phase detector identifies delays between said first and slower second clock signals, such that differences between said first and slower second clock signals are easily detected.