1
GATE ECE 2014 Set 4
Numerical
+2
-0
Consider two BJT's biased at the same collector current with area A1 = 0.2 μm × 0.2 μm and
A2 = 300 μm × 300 μm. Assuming that all other device parameters are identical, kT/q = 26
mV, the intrinsic carrier concentration is 1 × 1010 cm-3, and q = 1.6 × 10-19 C, the difference
between the base-emitter voltages (in mV) of the two BJT's (i.e., VBE1 – VBE2) is___________.
Your input ____
2
GATE ECE 2011
MCQ (Single Correct Answer)
+2
-0.6
The channel resistance of an N-channel JFET shown in the figure below is 600 W
when the full channel thickness (tch) of 10 μm is available for conduction. The
built-in voltage of the gate P+N junction (Vbi) is -1 V. When the gate to source
voltage (VGS) is 0 V, the channel is depleted by 1 μm on each side due to the built in
voltage and hence the thickness available for conduction is only 8 μm
The channel resistance when VGS = -3 V is
The channel resistance when VGS = -3 V is3
GATE ECE 2011
MCQ (Single Correct Answer)
+2
-0.6
The channel resistance of an N-channel JFET shown in the figure below is 600 W
when the full channel thickness (tch) of 10 μm is available for conduction. The
built-in voltage of the gate P+N junction (Vbi) is -1 V. When the gate to source
voltage (VGS) is 0 V, the channel is depleted by 1 μm on each side due to the built in
voltage and hence the thickness available for conduction is only 8 μm
The channel resistance when VGS = 0 V is
The channel resistance when VGS = 0 V is4
GATE ECE 2010
MCQ (Single Correct Answer)
+2
-0.6
In a uniformly doped BJT, assume that NE, NB and NC are the emitter, base and
collector dopings in atoms/cm3, respectively. If the emitter injection efficiency of
the BJT is close unity, which one of the following conditions is TRUE?
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