Externally synchronized timebase

Details Externally synchronized timebase Externally synchronized timebase

1984-05-25

1986-12-16

Bookbinder, Marc E.

Pulse or digital communications

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375108, 375120, 455 51, 331 11, 331 17, 328 63, 328 72, H04L 704, H03L 700

Patent

active

046302913

ABSTRACT:
A timebase adapted to be synchronized to an external clock comprises at least one generator incorporating a voltage-controlled oscillator adapted to be controlled by the result of comparing an external synchronization signal from an external clock with an output signal of the timebase. Each generator comprises at least one differential comparator receiving the external synchronization signal and the timebase output signal. It drives a summing circuit on the input side of the control input of the oscillator of the generator in question. The generator further comprises a calibration system comprising a threshold detector connected to the output of the phase comparator, a calibration voltage adjustment circuit connected between the threshold detector and a second input of the summing circuit, and a trigger circuit in and controlling the adjustment circuit.

REFERENCES:
patent: 3411103 (1968-11-01), Deman et al.
patent: 4005266 (1977-01-01), Lehr et al.
patent: 4027274 (1977-05-01), Fukui et al.
patent: 4107623 (1978-08-01), Graf et al.
patent: 4163946 (1979-08-01), Alberts
patent: 4164629 (1979-08-01), Ollivier et al.
patent: 4489412 (1984-12-01), Duplessis et al.

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