Patent ID: 6151356
Filing Date: 2000-11-21
Classification: H03L,H04L,H04N

Abstract:
A digital signal phase detector comprising:a data signal input for receiving a data signal;a clock signal input for receiving a clock signal;a first circuit coupled to the data signal input and the clock signal input and arranged to provide a phase difference signal representative of both the clock period of the clock signal and the difference in phase between the clock signal and the data signal;a second circuit coupled to the first circuit and arranged to provide a reference signal representative of the clock period of the clock signal and duration of whose pulses is dependent only on the clock period of the clock signal;a third circuit coupled to receive the phase difference signal and responsive to extend by a predetermined amount the duration of signal pulses of the phase difference signal; andwherein a comparison of the phase difference signal with the reference signal provides an indication of the phase difference between the clock signal and the data signal and an indication of the magnitude of said phase difference;and wherein the indication of the magnitude of the phase difference between the clock signal and the data signal varies linearly with said phase difference.