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# SRM University 2007 B.Tech Information Technology EC205 -- ELECTRONIC CIRCUITS - I - Question Paper

Wednesday, 30 January 2013 07:20Web
(b) What is the attenuation of input RC circuit at lower critical frequency
(c) If the midrange voltage gain of the amplifier is 100, what is the gain at lower critical frequency?
5. For an output RC circuit in a certain amplifier, Rc = 10K? and Cout = 0.1µf
& and RL = 10K?.
(a) Determine the critical frequency
(b) What is the attenuation of output RC circuit at critical frequency
(c) If the midrange voltage gain of the amplifier is 50, what is the gain at lower critical frequency?
6. Determine the critical frequency of the bypass RC circuit for the voltage divider
biased CE amplifier ( RS=1KO, R1=62KO, R2=22KO, RC=2.2KO, RE=1KO RL=10KO, CIN=10µf, COUT= 10µf, CE=100 µf, re` = 12?, ßac = 100 and VCC=10V).
7. Determine the total low frequency response of the amplifier ques. 6.
8. Use Miller’s theorem to determine amplifier capacitance.
9. Apply Miller’s theorem to the small signal amplifier in ques. six to
determine a high frequency equivalent circuit provided that Cbc = 3pF & Cbe
= 1pF.
10. Derive the high frequency input RC circuit for the amplifier in
ques. 6.
Also determine the critical frequency. The transistor data sheet provides the
subsequent : ß = 125, Cbe = 20Pf , Cbc = 2.4pF.

11. Derive the high frequency output RC circuit for the amplifier shown in
ques. 6. Also determine the critical frequency. The transistor data sheet provides the subsequent : ß = 125, Cbe = 20Pf , Cbc = 2.4pF.
12. Analyze the low frequency response of a FET amplifier.
13. Analyze the high frequency response of a FET amplifier.
14. What is the critical frequency of the input RC circuit in the self biased
E-MOSFET amplifier (RD=4.7KO, RG=10MO, C1=0.001µf, C2=0.001 µF, IGSS=25nA and VP=-10V).
15. Determine the total low frequency response of FET amplifier in
ques. 14. presume that the load is a different identical amplifier with the
identical Rin. The data sheet indicates IGSS = 100nA @ VGS = -12V.
16. Find the critical frequency of the high frequency input and output RC circuit
for the amplifier shown beneath. Ciss = 8pF, Crss = 3pF and gm = 6500µF.
(RS=50O, RD=1KO, RE=1kO, RG=10MO, RL=10MO, C1=10µf, C2=10 µF).
17. Analyze multi-stage amplifiers for frequency response.
Unit - V
Part -A
1. Define rectification.
2. What is rectifier
3. Draw the circuit of Half wave rectifier
4. Draw the circuit of full wave rectifier.
5. Draw the waveform of half wave rectifier.
6. Draw the waveform of full wave rectifier.