# For the differential amplifier shown in Figure 6: Assume well-matched transistors and  = 100 for all transistors: a) Wh...

###### Question:

For the differential amplifier shown in Figure 6: Assume well-matched transistors and  = 100 for all transistors:

a) Why it is important to use well-matched transistors in differential amplifier circuits? What is the potential influence of mismatched transistors on the performance of the differential amplifier?

b) Determine the resistor values (R1, R2 and R3) such that the emitter coupled current IE = 0.5 mA and VC1 = 3 V.

c) Draw the ac equivalent circuit for the single ended differential amplifier (you may represent the current mirror by its current source equivalent with ro = 150 kΩ).

d) Derive an expression for the circuit differential voltage gain.

e) Calculate the value of the differential voltage gain of the circuit.

f) Calculate the differential input resistance.

g) Find the common mode gain assuming that the current mirror circuit has ro = 150 kΩ.

h) Calculate the common mode rejection ratio in dB.

For the differential amplifier shown in Figure 6 Assume well-matched transistors and B 100 for all transistors a) Why it is important to use well-matched transistors in differential amplifier circuits? What is the potential influence of mismatched transistors on the performance of the differential amplifier b) Determine the resistor values (R1, R2 and R3) such that the emitter coupled current c) Draw the ac equivalent circuit for the single ended differential amplifier (you may represent the current mirror by its current source equivalent with ro 150 k) d) Derive an expression for the circuit differential voltage gain e) Calculate the value of the differential voltage gain of the circuit. f) Calculate the differential input resistance g) Find the common mode gain assuming that the current mirror circuit has ro-150 kΩ h) Calculate the common mode rejection ratio in dB R1IC1 R3 Q1 VC1 V1 Q2 V2 0V IE Q3 04 5v Figure 6 Single ended differential amplifier circuit

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