Q.1
If the inverse of transconductance is .5KS-what should be the value of Rc so that the overall voltage gain is 8?
Questionanalog-circuits-questions-answers1.jpg
  • a) About 3K
  • b) .4K
  • c) About 4K
  • d) Such a gain is not possible
Q.2
What is the input impedance of the following circuit, if channel length modulation is present?
Questionanalog-circuits-questions-answers2.jpg
  • a) gm || 1/ro
  • b) gm * ro
  • c) gm || 2/ro
  • d) gm
Q.3
The C.G. stage can be regarded as a current buffer.
  • a) True
  • b) False
Q.4
If M1 suffers from channel length modulation but M2 doesn’t, what is the voltage gain?
Questionanalog-circuits-questions-answers4.jpg
  • a) gm1 * Rd || 1/gm2 * gm2 * Rd2
  • b) gm1 * Rd || 1/gm2 * gm2 * 2Rd2
  • c) gm1 * Rd || 12/gm2 * gm2 * Rd2
  • d) gm1 * Rd * gm2 * Rd2
Q.5
If M2 suffers from channel length modulation but M1 doesn’t, what is the voltage gain?
Questionanalog-circuits-questions-answers5.jpg
  • a) 2gm1 * Rd || 1/gm2 * gm2 * Rd2
  • b) 2gm1 * Rd || 1/gm2 * gm2 * 2Rd2
  • c) gm1 * Rd || 12/gm2 * gm2 * Rd2
  • d) gm1 * Rd || 1/gm2 || ro2 * gm2 * Rd2
Q.6
If channel length modulation is present, what is the total impedance at node X?
Questionanalog-circuits-questions-answers6.jpg
  • a) Rd || ro1 || 1/gm2
  • b) Rd || ro1 || 1/gm2 || ro2
  • c) Rd || 2ro1 || 1/gm2 || ro2
  • d) Rd || ro1 || 2/gm2 || ro2
Q.7
For an ideal current source, what is the voltage gain of the following circuit?
  • a) gm1 * rd1 * gm2 * 2Rd2
  • b) – gm1 * rd1 * gm2 * Rd2
  • c) 2gm1 * rd1 * gm2 * Rd2
  • d) – gm1 * rd1 * gm2 * Rd2
Q.8
How can we reduce the number of MOSFET’s in the following circuit?
  • a) Scale the aspect ratio
  • b) Increase the transconductance
  • c) Increase the Power supply
  • d) Not possible
Q.9
What is the relation between Vb and Vin in the following circuit?
  • a) Vb > Vin by Vth
  • b) Vb = Vin
  • c) Vb < Vin by Vth
  • d) No relation
Q.10
What is the total output impedance at node x?
Questionanalog-circuits-questions-answers10.jpg
  • a) R1 || ro1 || 2 * ro2 || ro2 || 2*ro4 … || ron
  • b) R1 || 2 * ( ro1 || ro2 … || ron)
  • c) R1 || ro1 || ro2 … || ron
  • d) R1 + (ro1 || ro2 … || ron)
0 h : 0 m : 1 s