# Effect of Various Capacitors on Frequency Response – 2 MCQ’s

This set of Analog Electronic Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Effect of Various Capacitors on Frequency Response – 2″.

1. Ignoring early effect, if R_{2} is the total resistance at the collector, what could be the approximate output pole of a simple C.E. stage?

a) 1 / [R_{2} * (C_{cs} + C_{µ}*(1 + 2/g_{m}*R_{2}))]

b) 1 / [R_{2} * (C_{cs} – C_{µ}*(1 + 1/g_{m}*R_{2}))]

c) 1 / [R_{2} * (C_{cs} + C_{µ}*(1 – 1/g_{m}*R_{2}))]

d) 1 / [R_{2} * (C_{cs} + C_{µ}*(1 + 1/g_{m}*R_{2}))]

2. If the load resistance of a C.E. stage increases by a factor of 2, what happens to the high frequency response?

a) The 3 db roll off occurs faster

b) The 3 db roll off occurs later

c) The input pole shifts towards origin

d) The input pole becomes infinite

3. Ignoring early effect, if R_{1} is the total resistance connected to the base and R_{2} is the total resistance connected at the collector, what could be the approximate input pole of a simple C.E. stage?

a) 1 / [R_{1} * (C_{µ}(2+g_{m}*R_{2}) + C_{π})]

b) 1 / [R_{1} * (C_{µ}(1+2*g_{m}*R_{2}) + C_{π})]

c) 1 / [R_{1} * (C_{µ}(1+g_{m}*R_{2}) + C_{π})]

d) 1 / [R_{1} * (C_{µ}(1-g_{m}*R_{2}) + C_{π})]

4. During high frequency applications of a B.J.T., which of the following three stages do not get affected by Miller’s approximation?

a) C.E.

b) C.B.

c) C.C.

d) Follower

5. In a simple follower stage, C_{2} is a parasitic capacitance arising due to the depletion region between the collector and the substrate. What is the value of C_{2}?

a) 0

b) Infinite

c) C_{cs}

d) 2*C_{cs}

6. Ignoring early effect, if R_{1} is the total resistance connected to the collector; what is the output pole of a simple C.B. stage?

a) 1/[R_{1} * (C_{cs} + C_{µ})]

b) 1/[R_{1}* (C_{cs} + 2*C_{µ})]

c) 1/[R_{1} * (2*C_{cs} + C_{µ})]

d) 1/[R_{1} * 2*(C_{cs} + C_{µ})]

7. Ignoring early effect, if C_{1} is the total capacitance tied to the emitter, what is the input pole of a simple C.B. stage?

a) 1/g_{m} * C_{1}

b) 2/g_{m} * C_{1}

c) g_{m} * C_{1}

d) g_{m} * 2C_{1}

8. If early effect is included, and R_{1} is the total resistance connected at the collector. What is the output pole of a simple C.B. stage?

a) 1/[(R_{1} || ro) * 2(C_{cs} + C_{µ})]

b) 1/[(R_{1} || ro) * (C_{cs} + C_{µ})]

c) 1/[(R_{1} || ro) * (2*C_{cs} + C_{µ})]

d) 1/[(R_{1} || ro) * 2*(C_{cs} + 2*C_{µ})]

9. For a cascode stage, with input applied to the C.B. stage, the input capacitance gets multiplied by a factor of ____

a) 0

b) 1

c) 3

d) 2

10. If 1/h_{12} = 10 for a C.E. stage, what is the value of the base to collector capacitance, after Miller multiplication, at the output side?

a) 1.1C_{µ}

b) 1.2C_{µ}

c) 2.1C_{µ}

d) 2.2C_{µ}

11. The transconductance of a B.J.T.is 5mS (g_{m}) while a 2KΩ (R_{l}) load resistance is connected to the C.E. stage. Neglecting the Early effect, what is the Miller multiplication factor for the input side?

a) 21

b) 11

c) 20

d) 0

12. If the B.J.T. is used as a follower, which capacitor experiences Miller multiplication?

a) C_{π}

b) C_{µ}

c) C_{cs}

d) C_{b}

13. If 1/h_{12} = 4, for a C.E. stage- what is the value of the base to collector capacitance, after Miller multiplication, at the input side?

a) 4C_{µ}

b) 5C_{µ}

c) 6C_{µ}

d) 1.1C_{µ}

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