Method and device for accurate phase switching of similar pulse trains having different phase positions

A device for accurate phase switching of similar pulse trains having different phase positions, from which a respectively selected pulse train determines a pulse train to be distributed by means of a phase locked loop, comprising:

• a respective phase shift adjustment circuit for each of the similar pulse trains, each respective phase shift circuit having an input for a respective similar pulse train, a further input for a distributed pulse train and an output for a respective output voltage;
• and
• an electronic multiway Switch connected at the output of each phase shift adjustment circuit for selectively switching a respective output signal into the phase locked loop;
• wherein each respective phase shift adjustment circuit comprises:
• a discretely adjustable delay line for receiving and delaying the respective similar pulse train,
• a phase discriminator for producing a phase error voltage dependent on a phase difference between the delayed respective similar pulse train and the distributed pulse train, and
• a trackable voltage source for superimposing a correcting voltage on the phase error voltage which compensates the phase error voltage, as long as the phase shift adjustment circuit is not switched into the phase locked loop by means of the electronic multiway switch, said correcting voltage being maintained at a last adjusted value.

A device for accurate phase switching of similar pulse trains having different phase positions, from which a respectively selected pulse train determines a pulse train to be distributed by means of a phase locked loop, comprising:

• a respective phase shift adjustment circuit for each of the similar pulse trains, each respective phase shift circuit having an input for a respective similar pulse train, a further input for a distributed pulse train and an output for a respective output voltage;
• an electronic multiway switch connected at the output of each phase shift adjustment circuit for selectively switching a respective output signal into the phase locked loop;
• and
• a frame insertion circuit in the phase locked loop, the frame insertion circuit including a counter, wherein, depending on the state of the counter, synchronizing marks are inserted into the pulse train to be distributed so that, even if all of the similar pulses fail, a complete pulse train to be distributed is generated.