STUPIDSID
Solve any Five
1(a)
Define CMRR. Derive the expression for CMRR of a BJT differential amplifier.
4 M
1(b)
Draw the circuit diagram of an inverting amplifier using Op-Amp and derive expression for its voltage gain.
4 M
1(c)
Differentiate between small signal BJT and power BJT.
4 M
1(d)
For the circuit shown below find IQ.
For both MOSFETs VTN = 1V, Kn = 100 μA/V2.
For both MOSFETs VTN = 1V, Kn = 100 μA/V2.
4 M
1(e)
Explain working of Integrator using Op-Amp.
4 M
1(f)
For differential amplifier with Ad = 100 and Ac = 0.1. If two sets of inputs are applied as given below.
(i) V1 = 100μ V, V2 = 80μV
(ii) V1 = 200μV, V2 = 160μV
Determine output voltage in each case.
(i) V1 = 100μ V, V2 = 80μV
(ii) V1 = 200μV, V2 = 160μV
Determine output voltage in each case.
4 M
2(a)
Determine the corner frequency and maximum gain of the MOSFET amplifier shown in figure.
The transistor parameters are VTP = -2V, KP = 0.25 mA/V2 and λ = 0
The transistor parameters are VTP = -2V, KP = 0.25 mA/V2 and λ = 0
10 M
2(b)
For the circuit in Fig. 2B, Find midband gain and corner frequencies.
10 M
3(a)
The cascode circuit shown in Fig. 3A has parameters V+ = 12V, V- = 0V, R1 = 58.8kΩ, R2 = 33.3kΩ, R3 = 7.92kΩ, RC = 7.5kΩ, RS = 1kΩ, RE = 0.5k7Omega and RL = 2kΩ. The transistor parameters are β = 100, VBE = 0.7V, VA = 7infin, Cπ = 24pf and Cu = 3pf.
(i) Determine upper 3db frequencies corresponding to the input and output portions of the equivalent circuit.
(ii) Calculate small signal midband voltage gain.
(i) Determine upper 3db frequencies corresponding to the input and output portions of the equivalent circuit.
(ii) Calculate small signal midband voltage gain.
10 M
3(b)
Determine the differential and common-mode input resistance of a differential amplifier in figure below:
The transistor parameters are VBE(ON) = 0.7V, β = 100 and VA = 100V.
The transistor parameters are VBE(ON) = 0.7V, β = 100 and VA = 100V.
10 M
4(a)
Draw a neat diagram and explain working of the improved 3 transistor (MOSFET) current source. Derive the relationship between the output current and reference current.
10 M
4(b)
Draw the circuit diagram for an inverting summing amplifier using operational amplifier. Derive the relationship for its output voltage V0 for four inputs V1, V2, V3 and V4.
10 M
5(a)
Explain Class ' B operations of power amplifier. What is crossover distortion? How is it eliminated.
10 M
5(b)
For the circuit shown fig. 5B, the transistor parameters are β = 100, PDMAX = 2.5W, VCEMAX = 500mA. If RL = 100Ω then find Vcc and RB to deliver maximum power to the load. With the obtained values of Vcc and RB calculate the maximum undistorted ac power that can be delivered to RL.
10 M
Write short notes on any Four
6(a)
Zener Shunt Regulator
5 M
6(b)
Power MOSFET
5 M
6(c)
Active Filters
5 M
6(d)
Multistage Filters
5 M
6(e)
Millers Theorem.
5 M
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