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Analog Circuits
Analog Circuits Assessment
Quiz 1
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Q.1
If the inverse of transconductance is .5KS-what should be the value of Rc so that the overall voltage gain is 8?
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?
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?
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?
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?
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?
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)
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