Patent ID: 6121846
Filing Date: 2000-09-19
Classification: H03D,H03J,H03L,H04B

Abstract:
A digital phase comparator comprisinga first signal input and a second signal input for inputting periodic signals,a first output and a second output for outputting output pulses,means for producing an output pulse to the first output and second output per each cycle of the periodic signals brought to the first signal input and second signal input so that the duration of the output pulse produced to the first output is longer than the duration of the output pulse produced to the second output when the phase of the periodic signal brought to the first signal input is lagging with respect to the of the periodic signal brought to the second signal input, and the duration of the output pulse produced to the first output is shorter than the duration of the output pulse produced to the second output when the phase of the periodic signal brought to the first signal input is leading with respect to the phase of the periodic signal brought to the second signal input;wherein the digital phase comparator is arranged so as to make the starting times of the output pulses produced to the first output and second output substantially simultaneous.