GATE (Graduate Aptitude Test in Engineering) Electronics: Questions 692 - 698 of 1076

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Passage

Consider a baseband binary PAM receiver shown below. The additive channel noise is with power spectral density . The low-pass filter is ideal with unity gain and cut-off frequency . Let represent the random variable .

, if transmitted bit

, if transmitted bit

Where, represents the noise sample value. The noise sample has a probability density function,

(This has mean zero and variance ) .

Assume transmitted bits to be equiprobable and threshold is set to .

A Baseband Binary PAM Receiver

Question 692 (1 of 2 Based on Passage)

SNR and BER for Digital Modulation

Appeared in Year: 2010

Question

MCQ▾

The probability of bit error is

Choices

Choice (4)Response

a.

b.

c.

d.

Question 693 (2 of 2 Based on Passage)

Appeared in Year: 2010

Question

MCQ▾

The value of the parameter α (in ) is

Choices

Choice (4)Response

a.

b.

c.

d.

Question 694

Appeared in Year: 2019

Question

MCQ▾

The dispersion equation of a waveguide, which relates the wave number k to the frequency , is

=

Where c is the speed of light ( m/sec) and is a constant. If the group velocity = m/sec then the phase velocity is

(Carry One Mark Each)

Choices

Choice (4)Response

a.

b.

c.

d.

Question 695

Amplitude Modulation and Demodulation

Appeared in Year: 2010

Question

MCQ▾

The Nyquist sampling rate for the signal s (t) = is given by

Choices

Choice (4)Response

a.

b.

c.

d.

Question 696

Angle Modulation and Demodulation

Appeared in Year: 2010

Question

MCQ▾

Consider an angle modulated signal . The average power of is

Choices

Choice (4)Response

a.

b.

c.

d.

Question 697

Appeared in Year: 2010

Question

MCQ▾

In the silicon BJT circuit shown below, assume that the emitter area of transistor is half that of transistor .

The Emitter Area of Transistor

The value of current I0 is approximately

Choices

Choice (4)Response

a.

b.

c.

d.

Question 698

Diffusion Current, Drift Current, Mobility and Resistivity

Appeared in Year: 2019

Question

MCQ▾

In the circuits shown, the threshold voltage of each transistor is . Ignoring the effect of channel length modulation and body bias, the values of and , respectively, in volts, are (Carry One Mark Each)

The Threshold Voltage of Each nMOS Transistor

Choices

Choice (4)Response

a.

1.8 and 1.2

b.

2.4 and 1.2

c.

1.8 and 2.4

d.

2.4 and 2.4

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