Download AKTU B-Tech 4th Sem 2014-15 Electronic Circuits Question Paper

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(Following Paper ID and Roll No. to be filled in your Answer Book)

PAPER ID: 131406

Roll No.

B.Tech.

(SEM. IV) THEORY EXAMINATION, 2014-15

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ELECTRONIC CIRCUITS

Time: 3 Hours]

[Total Marks: 100

Note: (1) Attempt all questions.

(2) All questions carry equal marks.

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1. Attempt any four parts of the following:- 5×4=20

   1. Draw the circuit diagram of difference amplifier using OP-AMP and calculate the differential gain (A) and differential input resistance(Rid).

   2. For the circuit in Fig. (1) calculate the values of V1, 11,12,70, ir and io. Also calculate the voltage gain, current gain and power gain.

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   3. An inverting amplifier with nominal gain of -20V/V employs an op-amp having a dc gain of 104 and a unity gain frequency of 106Hz. What is the 3-dB frequency f3dB of the closed loop amplifier? What is the gain at 0.1 f3dB and at 10f3dB

   4. 1. Describe the terms Unity- gain Bandwidth and Full-power Bandwidth.

      2. For an op-amp having a slew rate of 60 V/us, what is the highest frequency at which a 20-V peak to peak sine wave can be produced at the output.

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2. Attempt any four parts of the following:- (5×4=20)

   1. Derive the ia-Vas relationship for NMOS working in saturation region.

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   2. 1. Find the dc quantities ID and VD

      2. Calculate the value of gm at the bias point.

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      3. Calculate the value of voltage gain.

      4. If the MOSFET has ?=0,001V-1, find ro at the bias point and calculate the voltage gain.

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   4. Calculate the overall gain G = Vo/Vsig, input resistance and output resistance for a Common Source Amplifier.

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