Zero-crossing comparators with threshold validation

Details Zero-crossing comparators with threshold validation Zero-crossing comparators with threshold validation

1980-09-12

1982-10-05

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307360, 328146, 328150, H03K 5153, G01R 19175

Patent

active

043529992

ABSTRACT:
In carrier and timing recovery systems for high performance data modems it is essential to employ threshold comparators and to be able to determine accurately zero-crossing instants. The circuit of the invention comprises a comparator with feedback which produces a positive transition of the comparator output in response to the negative zero-crossing transition of the input signal on condition that the previous half-cycle of the input signal has exceeded the positive reference threshold. In a practical arrangement two comparators are provided together with a pair of bistable storage elements which produces a narrow pulse in response to the negative zero-crossing transition of an input signal provided that the input signal has exceeded the positive reference threshold applied to the second comparator.

REFERENCES:
patent: 3348068 (1967-10-01), Miller
patent: 3718864 (1973-02-01), Kelly et al.
patent: 4090144 (1978-05-01), Jenik et al.
patent: 4162454 (1979-07-01), Olsen

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