1
GATE ECE 2003
MCQ (Single Correct Answer)
+2
-0.6
A DSB-SC signal is to be generated with a carrier frequency fc = 1MHz using a
nonlinear device with the input-output characteristic $$v_0=a_0v_i\;+\;a_1v_i^3$$.where a0 and a1 are constants. The output of the nonlinear device can be filtered
by an appropriate band-pass filter. Let $$v_0=A_c'\;\cos\left(2{\mathrm{πf}}_\mathrm c'\mathrm t\right)\;+\;m\left(t\right)$$ where m(t) is the message signal. Then the value of
$$f_c'$$ (in MHz) is
2
GATE ECE 2003
MCQ (Single Correct Answer)
+2
-0.6
Let $$m\left(t\right)\;=\cos\left[\left(4\mathrm\pi\times10^3\right)t\right]$$ be the message signal and
$$c\left(t\right)\;=5\cos\left[2\mathrm\pi\times10^6t\right]$$ be the carrier.
c(t) and m(t) are used to generate an AM signal. The modulation index of the generated AM signal is 0.5. Then the quantity $$\frac{Total\;sideband\;power}{Carrier\;power}$$ is
3
GATE ECE 2003
MCQ (Single Correct Answer)
+2
-0.6
Let $$m\left(t\right)\;=\cos\left[\left(4\mathrm\pi\times10^3\right)t\right]$$ be the message signal and
$$c\left(t\right)\;=5\cos\left[2\mathrm\pi\times10^6t\right]$$ be the carrier.
c(t) and m(t) are used to generate an FM signal. If the peak frequency deviation of the generated FM signal is three times the transmission bandwidth of the AM singal, then the coefficient of the term $$\cos\left[2\mathrm\pi\left(1008\times10^3\right)t\right]$$ in the FM signal (in terms of the Bessel coefficients) is
4
GATE ECE 2003
MCQ (Single Correct Answer)
+2
-0.6
The input to a linear delta modulator having a step size $$\Delta $$ = 0.628 is a sine wave with frequency fm and peak amplitude Em. If the sampling frequency fs = 40 KHz. the combination of the sine-wave frequency and the amplitude, where slope overload will take place is
Paper analysis
Total Questions
Analog Circuits
12
Communications
8
Control Systems
11
Digital Circuits
11
Electromagnetics
9
Electronic Devices and VLSI
8
Engineering Mathematics
1
Microprocessors
1
Network Theory
11
Signals and Systems
7
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