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GATE Electronics and Communications (EC) 2018 Solved Paper
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© examsnet.com
Question : 37
Total: 65
Let c(t) = A
c
cos (2πf
c
t) and m(t) = cos (2πf
m
t). It is given that f
c
≫ 5f
m
. The signal c(t) + m(t) is applied to the input of a non-linear device, whose output v
o
(t) is related to the input v
i
(t) as
v
0
(t) = av
i
(t) + bv
i
2
(t)
where a and b are positive constants. The output of the non-linear device is passed through an ideal band-pass filter with center frequency f
c
and bandwidth 3 f
m
, to produce an amplitude modulated (AM) wave. If it is desired to have the side band power of the AM wave to be half of the carrier power, then a/b is
0.25
0.5
1
2
Validate
Solution:
© examsnet.com
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