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Gate 2019: Electronic Devices and Circuits Quiz 4

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Question 1

The light emitted by a red LED has a wavelength of 950 nm. Then the bandgap energy of the semiconductor material of that particular red LED is (if the Boltzman’s constant is 1.381 X10-23 J/ K and the Planck’s constant= 6.626 X 10-34 J-s).

Question 2

A FM modulated wave is passed through the following circuit for noise rejection. Given that the peak to peak amplitude of the carrier wave is 20 V and that of message is 5 cos (ωt+ϕ), a function of time t. Determine the value of VR1 and VR2, so that the additive noise signal can be removed effectively without distorting the message signal. (Neglect the resistance of the diode.)

Question 3

Determine IR and Iz. Consider β= 50.

Question 4

In the figure, assume that the forward voltage drops of the PN diode D1 and Schottky diode D2 are 0.7 V and 0.3 V, respectively. If ON denotes conducting state of the diode and OFF denotes non-conducting state of the diode, then in the circuit,

Question 5

Find the correct match between Group 1 and Group 2:

Question 6

Consider an abrupt p-junction. Let Vbi be the built-in potential of this junction and VR be the applied reverse bias. If the junction capacitance (C1) is 1 pF for Vbi + VR = 1V, then for Vbi + VR = 4V, Cj will be
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Jun 5ESE & GATE EC