Pulse and Digital Circuits

8.5 EMITTER-COUPLED MONOSTABLE MULTIVIBRATORS

In the collector-coupled monostable circuit, for the gate width T to be stable, the ON device, in the quasi-stable state, is required to be driven into saturation [see Eq. (8.2)]. Once a device is driven into saturation the storage time becomes longer. Hence, the switching speed of the multivibrator is reduced, which is considered as the main limitation of this circuit.

Further, as there is a cross-coupling from the second collector to the first base in the collector-coupled monostable multivibrator, if the cross-coupling network loads the collector circuit, the voltage change at this collector may not necessarily be V_CC. This reduced voltage change at the second collector may not in turn drive