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___________.
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2
GATE ECE 2014 Set 4
MCQ (Single Correct Answer)
+1
-0.3
In the figure ln(ρi) is plotted as a function of 1/T, where ρi the intrinsic resistivity of silicon, T is is the temperature, and the plot is almost linear. GATE ECE 2014 Set 4 Electronic Devices and VLSI - Semiconductor Physics Question 35 English

The slope of the line can be used to estimate

A
Band gap energy of silicon (Eg)
B
Sum of electron and hole mobility in silicon $$\left(\mu_n+\mu_p\right)$$
C
Reciprocal of the sum of electron and hole mobility in silicon $$\left(\mu_n+\mu_p\right)^{-1}$$
D
Intrinsic carrier concentration of silicon (ni)
3
GATE ECE 2014 Set 4
Numerical
+1
-0
The cut-off wavelength (in µm) of light that can be used for intrinsic excitation of a semiconductor material of bandgap Eg= 1.1 eV is ________.
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4
GATE ECE 2014 Set 4
Numerical
+2
-0
Consider a silicon sample doped with ND = 1×1015/cm3 donor atoms. Assume that the intrinsic carrier concentration ni = 1.5×1010/cm3. If the sample is additionally doped with NA = 1×1018/cm3 acceptor atoms, the approximate number of electrons/cm3 in the sample, at T=300 K, will be _________________.
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