1

GATE ECE 2022

Numerical

+1

-0.33

A p-type semiconductor with zero electric field is under illumination (low level injection) in steady state condition. Excess minority carrier density is zero at x = $$\pm$$ 2l_{n}, where l_{n} = 10^{$$-$$4} cm is the diffusion length of electrons. Assume electronic charge, q = $$-$$1.6 $$\times$$ 10^{$$-$$19} C. The profiles of photo-generation rate of carriers and the recombination rate of excess minority carriers (R) are shown. Under these conditions, the magnitude of the current density due to the photo-generated electrons at x = +2_{ln} is ___________ mA/cm^{2} (rounded off to two decimal places).

Your input ____

2

GATE ECE 2015 Set 1

MCQ (Single Correct Answer)

+1

-0.3

A region of negative differential resistance is observed in the current voltage characteristics
of a silicon PN junction if

3

GATE ECE 2015 Set 1

Numerical

+1

-0

In the circuit shown below, the Zener diode is ideal and the Zener voltage is 6V. The output
voltage V

_{0}(in volts) is ________.Your input ____

4

GATE ECE 2014 Set 1

Numerical

+1

-0

When the optical power incident on a photodiode is 10μW and the responsivity is 0.8 A/W,
the photocurrent generated (in μA) is ________.

Your input ____

Questions Asked from PN Junction (Marks 1)

Number in Brackets after Paper Indicates No. of Questions

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