Assignment

Answer /discuss the following 5 questions. Your answers should be 2-3 sentences long with detailed explanations. Also solve the following 4 problems and include detailed formulations, calculations and explanations.

Questions:

1) Explain how a phototransistor operates and its main advantage over a photodiode.

2) Explain the conditions for "Cutoff" and "Saturation" for a BJT.

3) What is the use of RE connected to an emitter of a BJT transistor? What negative feedback means?

4) What is the effect of "Bypass capacitor" on voltage gain? What is the ideal value for it?

5) What are the main advantages of a CC-amplifier in a BJT transistor circuit? Why high input impedance is important?

Problems:

1) Analyze the circuit below to determine the correct voltages at the transistor terminals with respect to ground. Assume ßDC = 100.

2) The dc base voltages in the following figure are zero. Using your knowledge of transistor analysis, determine the dc differential output voltage. Assume that Q1 has an a = 0.980 and Q2 has an a = 0.975.

3) Identify the type of input and output configuration for each basic differential amplifier

4) Identify the quantity being measured by each meter in the following differential amplifier.