# 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 R2 is the total resistance at the collector, what could be the approximate output pole of a simple C.E. stage?
a) 1 / [R2 * (Ccs + Cµ*(1 + 2/gm*R2))]b) 1 / [R2 * (Ccs – Cµ*(1 + 1/gm*R2))]c) 1 / [R2 * (Ccs + Cµ*(1 – 1/gm*R2))]d) 1 / [R2 * (Ccs + Cµ*(1 + 1/gm*R2))]

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 R1 is the total resistance connected to the base and R2 is the total resistance connected at the collector, what could be the approximate input pole of a simple C.E. stage?
a) 1 / [R1 * (Cµ(2+gm*R2) + Cπ)]b) 1 / [R1 * (Cµ(1+2*gm*R2) + Cπ)]c) 1 / [R1 * (Cµ(1+gm*R2) + Cπ)]d) 1 / [R1 * (Cµ(1-gm*R2) + Cπ)]

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, C2 is a parasitic capacitance arising due to the depletion region between the collector and the substrate. What is the value of C2?
a) 0
b) Infinite
c) Ccs
d) 2*Ccs

6. Ignoring early effect, if R1 is the total resistance connected to the collector; what is the output pole of a simple C.B. stage?
a) 1/[R1 * (Ccs + Cµ)]b) 1/[R1* (Ccs + 2*Cµ)]c) 1/[R1 * (2*Ccs + Cµ)]d) 1/[R1 * 2*(Ccs + Cµ)]

7. Ignoring early effect, if C1 is the total capacitance tied to the emitter, what is the input pole of a simple C.B. stage?
a) 1/gm * C1
b) 2/gm * C1
c) gm * C1
d) gm * 2C1

8. If early effect is included, and R1 is the total resistance connected at the collector. What is the output pole of a simple C.B. stage?
a) 1/[(R1 || ro) * 2(Ccs + Cµ)]b) 1/[(R1 || ro) * (Ccs + Cµ)]c) 1/[(R1 || ro) * (2*Ccs + Cµ)]d) 1/[(R1 || ro) * 2*(Ccs + 2*Cµ)]

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/h12 = 10 for a C.E. stage, what is the value of the base to collector capacitance, after Miller multiplication, at the output side?
a) 1.1Cµ
b) 1.2Cµ
c) 2.1Cµ
d) 2.2Cµ

11. The transconductance of a B.J.T.is 5mS (gm) while a 2KΩ (Rl) 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) Cπ
b) Cµ
c) Ccs
d) Cb

13. If 1/h12 = 4, for a C.E. stage- what is the value of the base to collector capacitance, after Miller multiplication, at the input side?
a) 4Cµ
b) 5Cµ
c) 6Cµ
d) 1.1Cµ