Digital time error signal generator

Details Digital time error signal generator Digital time error signal generator

1990-07-26

1992-07-07

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

375120, H04L 2730

Patent

active

051289580

ABSTRACT:
A time error signal generator of the type employed in symbol time tracking loops is provided with a pre-accumulate and scale circuit for receiving an input data stream which is applied to a digital early sample-late sample circuit for generation an error signal indicative of a time magnitude difference between the analog transition time of the data and the chip strobe time multiplied by the sign of the data. The output of the early sample-late sample circuit is applied to a second accumulate and scale circuit for generating an accumulated error signal which is applied to an inverter. The inverter is provided with a decision directed tracking input indicative of the sign of the data sample and is employed to invert the accumulated error signal when the sign of the analog data is negative. The output of the inverter provides a digital time error tracking signal which is adapted to be coupled to a clock generation circuit or clock synthesizer for generating the tracking loop system clock as well as other strobe timing signals.

REFERENCES:
patent: 4166979 (1979-09-01), Waggener
patent: 4301537 (1981-11-01), Roos

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