1. In the circuit below, the diode is ideal. The voltage V is
given by
(A)
Min (Vi,1) (B)
max (Vi,1)
(C)
min(-Vi,1) (D) max
(-Vi,1)
2. Consider the following two statements about the internal
conditions in an n-channel MOSFET operating
in the active region.
S1 :
The inversion charge decreases from source to drain
S2 :
The channel potential increases from source to drain
Which of the following is correct ?
(A)
Both S1 and S2 is true
(B)
Both S1 and S2 is false
(C)
Both S1 and S2 is true, but S2 is not a reason
for S1
(D)
Both S1 and S2 is true, and S2 is a reason for
S1
Common Data Questions for 3 and 4 :
Consider a silicon P-N junction at room temperature having
the following parameters :
Doping on the n-side = 1 x 1017 cm-3
Depletion width on the n-side = 0.1 um
Depletion width on the p-side = 1.0 um
Intrinsic carrier concentration = 1.4 x 1010 cm-3
Thermal voltage = 26 mV
Permittivity of free space = 8.85 x 10-14 F.cm-1
Dielectric constant of silicon = 12
3. The built in potential of the junction is
(A)
0.70 V (B)
0.76 V (C) 0.82 V
(D)
cannot be estimated from the given data
4. The peak electric field in the device is
(A)
0.15 MV.cm-1, directed from p-region to
n-region
(B)
0.15 MV.cm-1, directed from n-region to
p-region
(C)
1.80 MV.cm-1, directed from p-region to
n-region
(D)
1.80 MV.cm-1, directed from n-region to
p-region
Linked Questions : 5 and 6
Consider the CMOS circuit shown, where the gate voltage VG
of the n-MOSFET is increased from zero, while the gate voltage of the p-MOSFET
is kept constant at 3 volts. Assume that , for both transistors, the magnitude
of the threshold voltage is 1 volt and the product of the trans conductance
parameter and the (W/L) ratio, i.e. the quantity µCox.(W/L) is 1 mA.
V-2.
5. For small increase in VG beyond 1 Volt, which of
the following fives the correct description of the region of operation of each
MOSFET ?
(A)
Both the MOSFETs are in saturation region
(B)
Both the MOSFETs are in triode region
(C)
N-MOSFET is in triode region and p-MOSFET is in
saturation region
(D)
N-MOSFET is in saturation region and p-MOSFET is
in triode region
6. Estimate the output voltage Vo for VG = 1.5
Volts. [Hint : Use the appropriate current voltage
equation for each MOSFET,
based on the answer to above Question]
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