TRANSISTOR BINARY PULSE REGENERATOR 



1081 



the decay transient is a damped oscillation and the base voltage passes 

 through zero at the next normal triggering time, sufficient damping must 

 be provided so the negative excursion is negUgible. The dashed line 

 shows how the effective bias at the emitter is modified by this voltage 

 across the base. 



Fig. 1 1 shows the measured values of plus insertion and minus omis- 

 sion errors for two set codes. These are plotted as functions of impulse 

 amplitude. The first code has alternate pulses and blanks while the 

 second consists of pairs of pulses separated by pairs of blanks. With 

 these two curves the error threshold values may be determined from 



REPEATER 



BLOCKING 



OSCILLATOR 



OUTPUT 



NO. 2 PLUS 

 I INSERTION 

 I THRESHOLD 

 I 



TIME 



TIME 



Fig. 10 — (a) Circuit diagram of blocking oscillator showing various compo- 

 nents of the effective bias, (b) The effective bias as a function of time, (c) Inhibit- 

 ing voltage Vb produced by a regenerated pulse. 



