What is the main advantage of including hysteresis in a switching element? What is a Schmitt trigger? Describe the operation of the Schmitt trigger circuit that employs two bipolar junction transistors as in Figure 8.19a. Even though a Schmitt trigger can be constructed using discrete elements in this manner, this device is commercially available in the monolithic form as a single IC chip. Suppose that a sinusoidal signal is applied to a Schmitt trigger, as schematically shown in Figure P8.32. Discuss the shape of the output signal. What is the output frequency?
Figure 8.19
