Exam 7: BJT Power Amplifiers

In a single- stage class- A amplifier, the quiescent current is the same as the

Figure 3 -Refer to Figure 3. With no signal in, IC(Q1)is ideally

Figure 7 -Refer to Figure 7. The expected dc emitter voltage for Q1 is

The Q point of a class- C amplifier is below cutoff.

In a class- B amplifier, the Q- point is at cutoff.

The amplifier type that has the worst efficiency is

Figure 1 -Refer to Figure 1. The power gain, Ap, to the load is approximately

In a class- AB amplifier, the transistors are biased slightly above cutoff to avoid

Figure 2 This is modification of Figure 1 (added Q₂, Q₃, and R_L, deletion of C₃ and a changed value of R_E1). -Refer to Figure 2. Assume Vout has dropped to about 1/2 the expected value. A likely cause is that

The maximum power from a class- A amplifier is equal to ICQVCEQ.

Figure 2 This is modification of Figure 1 (added Q₂, Q₃, and R_L, deletion of C₃ and a changed value of R_E1). -Refer to Figure 2, which is a modified circuit from Figure 1. The voltage gain, AV, of this circuit is approximately

Figure 1 -Refer to Figure 1. The input impedance is approximately

Class- C amplifiers are frequently used as audio amplifiers.

Figure 1 -Refer to Figure 1. The dc collector current is approximately

Figure 7 -Refer to Figure 7. The power delivered to the load is