--- Content provided by FirstRanker.com --- b) For the circuit shown below, calculate Zi, Zo and Av. Assume hfe = 500, hie = 1kΩ, hoe = 25µA/V, hre = 0. (Image missing, replace with actual image source or description) a) Explain the concept of cascading of amplifiers.
b) Calculate the overall gain of a two-stage amplifier with gains 10 and 20 respectively, when connected in cascade. Express the result in dB.
(7M)
b) Calculate the overall gain of a two-stage amplifier with gains 10 and 20 respectively, when connected in cascade. Express the result in dB.
(7M)
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UNIT - II
- a) Explain different types of feedback amplifiers.
b) An amplifier has a mid-band gain of 120 and a bandwidth of 50 kHz. i) If 6% negative feedback is introduced, find the new bandwidth and gain.
ii) If the bandwidth is to be increased to 600 kHz, find the feedback ratio.(7M)
- a) Explain the effect of feedback on amplifier characteristics.
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b) Explain the Barkhausen criteria for oscillations.(7M)
UNIT - III
- a) Draw and explain the working of RC phase shift oscillator using BJT.
b) A Hartley oscillator is designed with L1 = 2mH, L2 = 20µH and a variable capacitance. Determine the frequency of oscillation if C = 50pF.(7M)
- a) Explain the operation of Colpitts oscillator.
b) In a transistorized Colpitts oscillator, C1 = 0.2 µF, C2 = 0.02 µF and L = 10 µH. Determine the operating frequency.(7M)
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UNIT - IV
- a) What are the advantages of tuned amplifiers? Explain the single tuned amplifier with circuit diagram.
b) A single tuned amplifier uses a transistor with parameters gm = 2.5mA/V, rd = 50kΩ. The tuned circuit has L = 100µH and C = 100pF and R = 5Ω. Determine resonant frequency and bandwidth.(7M)
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- a) Explain the operation of a double tuned amplifier and its advantages.
b) Briefly discuss the stagger tuned amplifier.(7M)
UNIT - V
- a) Explain different non-linear applications of op-amps.
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b) Explain the operation of Schmitt trigger using op-amp with a neat diagram.(7M)
- a) Explain the working of first order high pass filter using op-amp with a neat diagram.
b) Design a phase shift oscillator to operate at a frequency of 5 kHz using op-amp.(7M)
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