Patent ID: 6118730
Filing Date: 2000-09-12
Classification: G11C,H03D,H03K,H03L

Abstract:
A phase comparator, comprising:a waveform processing circuit for modifying, based on a phase difference between a first input signal and a second input signal, a waveform of at least one of said first and second input signals to enlarge said phase difference for application to first and second internal nodes, respectively,said waveform processing circuit includinga first gate circuit for transmitting said first input signal to said first internal node when said first input signal makes a transition prior to said second input signal, and for connecting said first internal node to a power supply node when said second input signal makes a transition prior to said first input signal, anda second gate circuit for transmitting said second input signal to said second internal node when said second input signal makes a transition prior to said first input signal, and for connecting said second internal node to said power supply node when said first input signal makes a transition prior to said second input signal; anda comparison circuit for performing phase comparison between said first input signal and said second input signal based on a potential of said first internal node and a potential of said second internal node.