H - Electricity – 03 – L
Patent
H - Electricity
03
L
H03L 7/091 (2006.01) H03L 7/099 (2006.01) H04L 7/033 (2006.01) H03B 27/00 (2006.01)
Patent
CA 2190222
A microwave multiphase detector for demultiplexing and regenerating data from an incoming data stream includes N data channels and has a data rate R. For recovering data corresponding to a channel M, a detecting unit receives the data stream, detects a sampling phase corresponding to a data transition on channel M and generates a phase width modulated (pwm) pulse, phase modulated with the sampling phase. A digital to analog (D/A) conversion unit converts the pwm pulse to a contributing control voltage and a data regeneration unit provides a recovered data bit for channel (M). The detector is supplied with N variants of a local clock signal with a rate R/N, each variant being phase displaced with ~360°/N from the adjacent variants. A counterbalancing unit is also provided for each channel, such that if a pwm pulse is indeed generated, the contributing voltage for that pulse is compensated for with a balance pulse of opposed amplitude. In this way, the sampling phase corresponding to the respective M data channel may be adjusted by varying the ratio between the amplitudes of the pwm pulse and the balance pulse.
de Wilton Angela C.
Nortel Networks Limited
Northern Telecom Limited
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