CMOS pulse generator

pulse generator A pulse generator can be extremely useful when designing digital circuits. To make the most of its possibilities it must be as flexible as possible. The clock frequency must be variable over a fairly wide range and of course the pulse width must be variable also. An automatic output level control would be a major advantage. All these and a few other features are combined in the circuit given here. throughout has two advan- The use of CMOS tages. In the first place it is possible to power t circuit from batteries. Furthermore, the large supply voltage range afforded by CMOS, from 5 to 15 V, makes it possible to provide the automatic output control mentioned above. This is clear from the fact that if the pulse generator itself is powered from the circuit under test, the supply voltage will equal that of the circuit and the output logic levels must there- fore be compatible whether it is CMOS or TTL (out- then be used to select the required polarity for pins and 5 of ...