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Test: Effect of Various Capacitors on Frequency Response - Electronics and Communication Engineering (ECE) MCQ


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10 Questions MCQ Test GATE ECE (Electronics) Mock Test Series 2025 - Test: Effect of Various Capacitors on Frequency Response

Test: Effect of Various Capacitors on Frequency Response for Electronics and Communication Engineering (ECE) 2024 is part of GATE ECE (Electronics) Mock Test Series 2025 preparation. The Test: Effect of Various Capacitors on Frequency Response questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The Test: Effect of Various Capacitors on Frequency Response MCQs are made for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Effect of Various Capacitors on Frequency Response below.
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Test: Effect of Various Capacitors on Frequency Response - Question 1

During high frequency applications of a B.J.T., which parasitic capacitors arise between the base and the emitter?

Detailed Solution for Test: Effect of Various Capacitors on Frequency Response - Question 1

There are two capacitors that arise between bases and emitter. One is Cje due to depletion region associated between base and emitter. Cb is another capacitor which arises due to the accumulation of electrons in the base which further results into the concentration gradient within the base of the transistor.

Test: Effect of Various Capacitors on Frequency Response - Question 2

During high frequency applications of a B.J.T, which parasitic capacitors arise between the collector and the base?

Detailed Solution for Test: Effect of Various Capacitors on Frequency Response - Question 2

Only one capacitor up between the base and the collector. This is due to the depletion region present between the base and the collector region.

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Test: Effect of Various Capacitors on Frequency Response - Question 3

Which parasitic capacitors do not affect the frequency response of the C.E. stage, of the B.J.T.?

Detailed Solution for Test: Effect of Various Capacitors on Frequency Response - Question 3

While observing the frequency response of a C.E. stage, we find that all the parasitic capacitances of the B.J.T. end up slowing the speed of the B.J.T. The frequency response of this stage is affected by all the parasitic capacitors.

Test: Effect of Various Capacitors on Frequency Response - Question 4

Which parasitic capacitors don’t affect the frequency response of the C.C. stage of the B.J.T.?

Detailed Solution for Test: Effect of Various Capacitors on Frequency Response - Question 4

In the follower stage, the load is present at the emitter. The parasitic capacitors present between the collector and the substrate i.e. Cµ gets deactivated. This is observed from the small signal analysis where both the terminals of this capacitor get shorted to A.C. ground.

Test: Effect of Various Capacitors on Frequency Response - Question 5

If the total capacitance between the base and the emitter increases by a factor of 2, the transit frequency __________

Detailed Solution for Test: Effect of Various Capacitors on Frequency Response - Question 5

The transit frequency is almost inversely proportional to the total capacitance between the base and the emitter of the B.J.T. Hence, the transit frequency will approximately reduce by 2 and the correct option becomes reduces by 2.

Test: Effect of Various Capacitors on Frequency Response - Question 6

Which effect plays a critical role in producing changes in the frequency response of the B.J.T.?

Detailed Solution for Test: Effect of Various Capacitors on Frequency Response - Question 6

The miller effect results in a change in the capacitance seen between the base and the collector. This is why it affects the frequency response of the B.J.T. deeply by changing the poles and affecting the high frequency voltage gain stage.

Test: Effect of Various Capacitors on Frequency Response - Question 7

If a C.E. stage with early effect has a load Rl and transconductance gm, what is the factor by which the capacitance between the base and the collector at the output side, gets multiplied?

Detailed Solution for Test: Effect of Various Capacitors on Frequency Response - Question 7

 If the early effect is considered, the low frequency response of the C.E. stage becomes gm*(Rl || ro). Thereby, miller approximation shows that the capacitance between the base and the collector, looking from the output side, will be increased by a factor of 1 + 1/gm*(Rl || ro). Hence the correct option is 1 + 1/ gm*(Rl || ro).

Test: Effect of Various Capacitors on Frequency Response - Question 8

For a high frequency response of a simple C.E. stage with a transconductance of gm, what is Cout?

Detailed Solution for Test: Effect of Various Capacitors on Frequency Response - Question 8

We have a capacitor from the collector to substrate, Ccs, which comes in parallel to the miller approximation of the capacitance from base to collector. The miller approximation defines the latter as Cµ*(1 + 1/gm*R2). Since capacitors gets added, when in parallel, the correct option is Ccs + Cµ*(1+ 1/gm*R2).

Test: Effect of Various Capacitors on Frequency Response - Question 9

Which parasitic capacitors don’t affect the frequency response of the C.B. stage of the B.J.T.?

Detailed Solution for Test: Effect of Various Capacitors on Frequency Response - Question 9

All the parasitic capacitors of a B.J.T. affect the C.B. stage. None of the parasitic capacitors gets deactivated and they end up behaving as a pole during the frequency response of the C.B. stage.

Test: Effect of Various Capacitors on Frequency Response - Question 10

If the transconductance of the B.J.T increases, the transit frequency ______

Detailed Solution for Test: Effect of Various Capacitors on Frequency Response - Question 10

The transit frequency is directly proportional to the transconductance of the B.J.T. Hence, the correct option is increases. Since it hasn’t been mentioned that whether the transconductance has been doubled or not, we cannot conclude the option “doubles” as an answer.

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