1

GATE ECE 2016 Set 2

Numerical

+2

-0

Consider a region of silicon devoid of electrons and holes, with an ionized donor density of
$${\mathrm N}_\mathrm d^+=10^{17}\;\mathrm{cm}^{-3}$$. The electric field at x = 0 is 0 V/cm and the electric field at x = L is
50 kV/cm in the positive x direction. Assume that the electric field is zero in the y and z directions
at all points.

Given q = 1.6 × 10^{−19} coulomb, $$\varepsilon$$_{0} = 8.85 × 10^{−14} F/cm, $$\varepsilon$$_{r} = 11.7 for silicon, the value of L in
nm is ________.

Your input ____

2

GATE ECE 2015 Set 3

MCQ (Single Correct Answer)

+2

-0.6

The electric field profile in the depletion region of a p-n junction in equilibrium is shown
in the figure. Which one of the following statements is NOT TRUE?

3

GATE ECE 2015 Set 1

Numerical

+2

-0

The built-in potential of an abrupt p-n junction is 0.75V. If its junction capacitance
(C

_{J}) at a reverse bias (V_{R}) of 1.25V is 5pF, the value of C_{J}(in pF) when V_{R}= 7.25V is ___________.Your input ____

4

GATE ECE 2014 Set 2

Numerical

+2

-0

Consider an abrupt PN junction (at T = 300 K) shown in the figure. The depletion region width X

_{n}on the N-side of the junction is 0.2 µm and the permittivity of silicon (ε_{si}) is 1.044×10^{-12}F/cm. At the junction, the approximate value of the peak electric field (in kV/cm) is _________.Your input ____

Questions Asked from PN Junction (Marks 2)

Number in Brackets after Paper Indicates No. of Questions

GATE ECE 2017 Set 2 (1)
GATE ECE 2016 Set 3 (1)
GATE ECE 2016 Set 2 (1)
GATE ECE 2015 Set 3 (1)
GATE ECE 2015 Set 1 (1)
GATE ECE 2014 Set 2 (1)
GATE ECE 2013 (1)
GATE ECE 2009 (1)
GATE ECE 2007 (1)
GATE ECE 2005 (2)
GATE ECE 2003 (2)
GATE ECE 1993 (1)
GATE ECE 1992 (1)
GATE ECE 1991 (2)
GATE ECE 1987 (1)

GATE ECE Subjects

Signals and Systems

Representation of Continuous Time Signal Fourier Series Discrete Time Signal Fourier Series Fourier Transform Discrete Time Signal Z Transform Continuous Time Linear Invariant System Transmission of Signal Through Continuous Time LTI Systems Discrete Time Linear Time Invariant Systems Sampling Continuous Time Signal Laplace Transform Discrete Fourier Transform and Fast Fourier Transform Transmission of Signal Through Discrete Time Lti Systems Miscellaneous Fourier Transform

Network Theory

Control Systems

Digital Circuits

General Aptitude

Electronic Devices and VLSI

Analog Circuits

Engineering Mathematics

Microprocessors

Communications

Electromagnetics