Pulse and Digital Circuits

15.4 A MONOSTABLE MULTIVIBRATOR AS A DIVIDER

A monostable multivibrator can be used for synchronization with frequency division [see Fig. 15.9(a)] and the waveforms are shown in Fig. 15.9(b). Here, the positive pulse train is applied at B₁ through a small capacitance from a low impedance source.

The positive pulse train applied at B₁ gets quasi-differentiated as discussed earlier in the Section 15.3.4. The negative spikes at the trailing edge of the pulses are amplified and inverted and appear as the positive spikes at B₂. As a result, positive spikes due to the second pulse will prematurely terminate the time period resulting in synchronization with the frequency division of 2:1. On the other hand, if the amplitude of the pulses is large enough, ...