Microwave multiphase detector

Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels

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375373, H03D 324

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active

056848056

ABSTRACT:
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.degree./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.

REFERENCES:
patent: 4151485 (1979-04-01), LaFratta
patent: 5161173 (1992-11-01), Nordby
patent: 5185581 (1993-02-01), Brown
patent: 5301196 (1994-04-01), Ewen et al.
patent: 5329559 (1994-07-01), Wong
patent: 5408351 (1995-04-01), Huang
patent: 5473633 (1995-12-01), Fisher et al.
J. Hauenschild, "A 22 Gb/s Circuit and a 32 Gb/s Regenerating Demultiplexer IC Fabricated in Silicon Bipolar Technology", Paper 7.4, Bipolar Circuits and Technology Meeting, IEEE 1992.

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