Time caliper method with enhanced accuracy using an arbitrary waveform generator and time demultiplexer with fine clock offset

An improved time caliper method has been proposed for measuring a small relative delay of two signals transmitted on different channels. This is achieved by using a new method to generate two periodic pulse trains that have much smaller period difference, over 1000 times smaller than that in the prior scheme. The two pulse trains, with a period difference of 0.1 ps, are generated by an arbitrary waveform generator and a time demultiplexer, with a fine clock offset. The average and maximum measurement errors obtained are 0.68 and 1.67 ps, respectively.