Posted: October 1st, 2022

Please help to answer this paper

JANUARY 2018 CONFIDENTIAL

INSTRUCTION: Answer ALL questions.

Please use the answer booklet provided

Question 1Trans

Figure 1 shows the BJT transistor power amplifier. Calculate:

The power dissipation (8 marks)

The efficiency (8 marks)

Figure 1

Describe the characteristic, advantages, disadvantages and applications of each of the classes (A, AB, B, and C) of power amplifiers (9 marks)

Question 2

(a) Given a voltage divider JFET amplifier that has VDD = 20 V, VP = -4 V, VGSQ = -0.5 V, R1 = 82 M, R2 = 11 M, RD = 2 k, RS = 610 , RL = 10 M and IDSS = 8 mA. Analyze the DC and AC performances of the given JFET amplifier. (25 marks)

Question 3

Construct the summing amplifier based on the Op-Amp circuit that consist of three input signals of V1, V2, and V3 and also one output Vout. (3 marks)

Prove the following equation for the summing amplifier: (8 marks)

Describe four different types of active filter and sketch their expected frequency responses

(8 marks)

Describe the construction, operation and characteristic of Shockley diode. (6 marks)

Question 4

For the given Figure 2

Determinegm0andgm(4 marks)

DetermineAvandAvsin the mid-frequency range(4 marks)

DeterminefHiandfHo(8 marks)

Determine the cut-off frequencies (2 marks)

Sketch the asymptotes of the Bode Plot defined by the cut-off frequencies of part (iv)

(3 marks)

Determine the high frequency response for the amplifier using the results of part (v) (4 marks)

Figure 2

END OF EXAMINATION PAPER

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