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Analog Electronics
BJT
Small signal analysis of BJT

Questions mapped to Small signal analysis of BJT under BJT.

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Q#1 BJT GATE EE 2014 (Set 1) MCQ +1 mark -0.33 marks

The magnitude of the mid – band voltage gain of the circuit shown in figure is (assuming  of the transistor to be 100)

1

10

20

100

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Q#2 BJT GATE EE 2012 (Set 1) MCQ +2 marks -0.66 marks

The voltage gain  of the circuit shown below is

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Q#3 BJT GATE EE 2004 (Set 1) MCQ +1 mark -0.33 marks

The feedback used in the circuit shown in figure can be classified as

Shunt-series feedback

Shunt-shunt feedback

Series-shunt feedback

Series-series feedback

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Q#4 BJT GATE EE 2004 (Set 1) MCQ +2 marks -0.66 marks

The trans-conductance  of the transistor shown in figure is 10mS. The value of the input resistance  is         

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Q#5 BJT GATE EE 2001 (Set 1) MSQ +2 marks -0 marks

The transistor in the amplifier circuit shown in figure is biased at . Use

   

AC small signal mid-band voltage gain = -6.623

AC small signal mid-band voltage gain = -5.565

Value of  for the circuit to have a lower cutoff

frequency of 10 Hz = 265.08 micro F

Value of  for the circuit to have a lower cutoff

frequency of 10 Hz = 365.08 micro F

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Q#6 BJT GATE EE 1999 (Set 1) MSQ +2 marks -0 marks

For the small signal BJT amplifier shown in fig, Assume β = 100 and Frequency =1 kHz

 

Quiescent collector current = 1mA

Small signal voltage gain = -7.874

Maximum possible swing of the collector current = 4.36 mA

Quiescent collector current = 2mA

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Q#7 BJT GATE EE 1991 (Set 1) MSQ +2 marks -0 marks

Figure shows a common emitter amplifier

(a) Simplify the circuit by applying Thevenin’s theorem to the biasing network  at the base of the transistor

(b) Assuming  to be a short for the frequency range considered. Draw the small signal a.c. model of the circuit obtained in (a) by using the simple model for the transistor shown in figure.

(c) Evaluate the small signal gain of the amplifier.

Small signal a.c. model
C:\Users\Ankit\Dropbox\GATE papers\EE papers\Solutions\Analog Electronics\5 marks question\1991\Q19(b)_3.png

   

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