Multiple Choice Questions – Circle the best answer (2 points each 10 points total):
1. In the graph shown to the right,
identify the following regions of
operation by placing A, B or C
next to the names below:
• Cutoff
• Saturation
• Active
2. The small signal model amplifier analysis is based on a small signal variation around the
______ operating point.
a. AC
b. DC
c. Grounded
d. Temperature independent
3. List the procedures in the correct order for how to systematically solve an amplifier
circuit problem.
Step #1_______ #2_______ #3_______ #4_______
a. Verify that the DC operating condition is indeed in the active region.
b. Analyze the amplifier result for voltage gain, input resistance, etc.
c. Replace the transistor with either the hybrid pi or the T model. Eliminate the
sources by grounding the DC voltages, Open the DC current sources. Short all
capacitors
d. Solve the DC operating point of the transistor circuit.
4. The common emitter amplifier output signal is _____________ with respect to the input
signal.
a. non-inverting
b. inverting
5. The small signal model is a non-linear model that uses the small signal voltage vbe =
0.7V. (T or F)
1
, Problem 1. BJT DC biasing (25 pts)
a. Find the values for RC, RB1, VB and IB. The collector current is given and the collector
voltage is given. VBE = 0.68V and β = 100.
b. Verify the mode of operation.
2
1. In the graph shown to the right,
identify the following regions of
operation by placing A, B or C
next to the names below:
• Cutoff
• Saturation
• Active
2. The small signal model amplifier analysis is based on a small signal variation around the
______ operating point.
a. AC
b. DC
c. Grounded
d. Temperature independent
3. List the procedures in the correct order for how to systematically solve an amplifier
circuit problem.
Step #1_______ #2_______ #3_______ #4_______
a. Verify that the DC operating condition is indeed in the active region.
b. Analyze the amplifier result for voltage gain, input resistance, etc.
c. Replace the transistor with either the hybrid pi or the T model. Eliminate the
sources by grounding the DC voltages, Open the DC current sources. Short all
capacitors
d. Solve the DC operating point of the transistor circuit.
4. The common emitter amplifier output signal is _____________ with respect to the input
signal.
a. non-inverting
b. inverting
5. The small signal model is a non-linear model that uses the small signal voltage vbe =
0.7V. (T or F)
1
, Problem 1. BJT DC biasing (25 pts)
a. Find the values for RC, RB1, VB and IB. The collector current is given and the collector
voltage is given. VBE = 0.68V and β = 100.
b. Verify the mode of operation.
2
