Electronics and Communication Engineering
2022 · Paper 1
Take it one question at a time. Try an answer, then check your understanding.
Complete GATE ECE 2022 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 16–18 of 65. Imported answers require review unless explicitly marked reviewed.
Question 16
Open questionECMCQ1 markNeeds review
Consider a long rectangular bar of direct bandgap
-type semiconductor. The equilibrium hole density is
and the intrinsic carrier concentration is
. Electron and hole diffusion lengths are
and
, respectively.The left side of the bar (
) is uniformly illuminated with a laser having photon energy greater than the bandgap of the semiconductor. Excess electron-hole pairs are generated ONLY at
because of the laser. The steady state electron density at
is
due to laser illumination. Under these conditions and ignoring electric field, the closest approximation (among the given options) of the steady state electron density at
is _________.Your answerChoose one option.
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Open questionECMCQ1 markNeeds review
In a non-degenerate bulk semiconductor with electron density
, the value of
, where
and
denote the bottom of the conduction band energy and electron Fermi level energy, respectively. Assume thermal voltage as
and the intrinsic carrier concentration is
. For
, the closest approximation of the value of
, among the given options, is _________.Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 18
Open questionECMCQ1 markNeeds review
Consider the CMOS circuit shown in the figure (substrates are connected to their respective sources). The gate width (
) to gate length (
) ratios (
) of the transistors are as shown. Both the transistors have the same gate oxide capacitance per unit area. For the
MOSFET, the threshold voltage is
and the mobility of holes is
. For the
MOSFET, the threshold voltage is
and the mobility of electrons is
. The steady state output voltage
is _________. 
Your answerChoose one option.
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