5–60 Digital Clock Generator Timing digital circuits is vital to the operationofany digital device.

Using an ideal OP AMP (running open-loop, i.e., without feedback)

and appropriate resistors,designaway toconvert a sinusoid into a square wave that varies from −15 to 15 V with a period of 1 ms. The only non-sinusoidal supply available is VCC = ±15 V.