2. A switch like the one shown in Figure 24.36 has the following values: Vcc=+12V, hfe=150, Rc=1.1k
ohms, and Rb=47k ohms. Determine the minimum high input voltage required to saturate the transistor.
= 12V/1.1k ohms
2. An amplifier has values of f0=1200 kHz and BW=300 kHz. Calculate the value of Q for the circuit.
4. An amplifier with a geometric center frequency of 1100kHz has a Q of 25. Calculate the bandwidth of
Chapter 22: Practice Problems 2, 4, 6, 12, 14, 18, 22, and 24
Chapter 22: Practice Problem 20
2. Determine the output polarity for each of the op-amps shown in Figure 22.47.
(a) V1=3V, V2=2.8V
Vdiff=V2 - V1 = 2.8V - 3V = -0.2V Negative
(b) V1=1.8V, V2=2.2
18 . For each circuit shown in Figure 19.47, identify the type of transistor, and indicate the direction of
the terminal currents.
a. npn - towards the emitter
b. pnp - towards the base and collector
c. pnp - towards the base and collector