SELF-TIMING REGENERATIVE REPEATERS 



895 



modified accordingly. A maxiniiiin value of zero is, however, convenient 

 from the standpoint of instrumentation. 



A limiting shape of retiming wave that would result in complete re- 

 timing, iuit without the need for special sampling is also illustrated in 

 Fig. 1. 



1 ..'i Derivation of Timing Wave from Pulse Train 



As shown abo\'e, the retiming wave must be essentially periodic, with 

 a fundamental frequency equal to the pulse repetition frequency./' = 1/T, 

 where T is the interval between pulses. The simplest form is a sinusoidal 

 wave, which can be derived from the pulse train at repeaters with the 

 aid of a narrow band-pass filter, such as a simple resonant circuit cen- 



PULSE 

 TRAIN 



COMPLETE RETIMING 



Fig. 1 — Principle of partial retiming method. 



