Externally synchronized timebase

DETAILED DESCRIPTION The invention consists in a multi-generator externally synchronized timebase, with majority decision logic circuits receiving output signals from the generators of said timebase and each derivating an individual majority clock signal for one of said generators, which is controlled by an external synchronization signal and by an output signal of said timebase, each generator comprising: a voltage-controlled oscillator, a first differential phase comparator having respective inputs connected to receive said external synchronization signal and said output signal of the timebase, a second differential phase comparator having respective inputs connected to receive said individual majority clock signal from said generator and an output signal from said voltage-controlled oscillator, a calibration system including a threshold detector connected to the output of said first comparator and a calibration voltage adjustment circuit connected to the output of said threshold detector, a summing circuit having its inputs respectively connected to the outputs of said calibration voltage adjustment circuit and of said first and second phase comparators and having its own output connected to a voltage control input of said voltage controlled oscillator.
Other objects and advantages will appear from the following description of an example of the invention, when considered in connection with the accompanying drawings, and the novel features will be particularly pointed out in the appended claims.