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ESE EE : Analog Electronics Champion Quiz 2
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Question 1
A cascaded amplifier comprises N identical non-interacting stages, each having a lower 3 dB frequency of fL. If fL* is the lower 3 dB frequency of the cascaded amplifier, then which one of the following is correct?
Question 2
The noise figure of a lossy network at room temperature equals the
Question 3
fT is the frequency at which the short circuit.
Question 4
Which one of the following statements is correct? The rise time of an amplifier is
Question 5
A transistor RC coupled amplifier is designed for a voltage and band gain of 20. But a measurement at a particular frequency shows the gain to be only 14. What is the likely phase shift at this frequency ?
(consider low frequency analysis)
(consider low frequency analysis)
Question 6
Consider the following statements.
1) To achieve wide bandwidth, a transistor was a small Cb,c is chose.
2) To achieve wide bandwidth, a transistor with a small Cb,e is chosen.
3) To achieve wide bandwidth, a transistor with a small base spreading resistance is chosen. Which of the statements given above are correct.
1) To achieve wide bandwidth, a transistor was a small Cb,c is chose.
2) To achieve wide bandwidth, a transistor with a small Cb,e is chosen.
3) To achieve wide bandwidth, a transistor with a small base spreading resistance is chosen. Which of the statements given above are correct.
Question 7
Consider the following statements:
We would be able to achieve broad banding in a common source FET amplifier, by
1) resonance between the shunt capacitances and a compensating inductance.
2) RC compensating network between source and drain.
3) connecting compensating network in series with the coupling capacitors.
Which of the statement given above is/are correct?
We would be able to achieve broad banding in a common source FET amplifier, by
1) resonance between the shunt capacitances and a compensating inductance.
2) RC compensating network between source and drain.
3) connecting compensating network in series with the coupling capacitors.
Which of the statement given above is/are correct?
Question 8
A tuned amplifier has peak output at 2MHz and quality factor 50. The bandwidth and 3- dB frequencies shall be at what value respectively?
Question 9
The two stages of a cascade amplifier have and individual upper cut-off frequencies f1=5MHzand f2 =3.33MHz. What is the best approximation for the upper cut-off frequency of the cascade combination?
Question 10
The 3-dB cut-off frequency of a DC amplifier 5MHz. What is its rise time?
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