Pulse or digital communications – Repeaters – Testing
Patent
1983-05-26
1985-08-13
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
375120, 328133, H03K 117, H03K 5156
Patent
active
045354596
ABSTRACT:
A phase detection function is obtained by performing two series retiming operations on a data input signal in accordance with a local clock and exclusive OR'ing the signals involved in the two retiming operations. The first exclusive OR'ing provides a variable pulse width signal and the second exclusive OR'ing provides a fixed pulse width signal which may be used as a reference. The combination of the two signals can then be used to provide an indication of phase of the clock with respect to the data. By taking the phase detected signal and supplying it in integrated format to a VCO and using the output of the VCO to provide the clock input to the retiming means, a circuit is provided which provides not only data regeneration, but also clock recovery from the data input and assures that the leading edge of the recovered clock is centered between positive going and negative going transitions of the data to be regenerated. This regeneration can take place in the form of jitter reduction, pulse amplitude restore and pulse width restore. The same circuitry can also, through the addition of one feedback loop, provide data equalization.
REFERENCES:
patent: 4222009 (1980-09-01), Moulton et al.
patent: 4227251 (1980-10-01), Kazama et al.
patent: 4305045 (1981-12-01), Metz et al.
patent: 4371974 (1983-02-01), Dugan
patent: 4380815 (1983-04-01), Clendening
patent: 4400667 (1983-08-01), Belkin
patent: 4400817 (1983-08-01), Summer
Chin Stephen
Griffin Robert L.
Hamann H. Fredrick
Lutz Bruce C.
Rockwell International Corporation
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