Applying the asynchronous stroboscopic method of sampling to broadband signal recorders

Abstract

A repetitive pulse recorder based on the asynchronous stroboscopic sampling method has been developed. The heart of the method is as follows: with each triggering of the recorder, the phase of the triggering pulse, relative to the one closest to it in a set of internal synchronization pulses, is measured along with samples of the input signal. Since the external trigger and frequency of the internal oscillator are asynchronous, the phase value upon a restart of the recorder is random and equiprobable over the range of the synchronizing generator’s period. It is possible to increase the sampling frequency with respect to the initial synchronizing frequency by processing the results from a series of restarts. A sampling frequency of 1 GHz was obtained in the recorder by processing 30 sets with a 100-MHz sampling frequency.