Question

An amplitude modulated wave is as shown in the figure the value of peak carrier voltage and value of peak information voltage are respectively.

• A. 30 V, 20 V
• B. 10 V, 15V
• C. 15 V, 30 V
• D. 20 V, 25 V

Answer 1

Answer: (A)

30 V, 20 V

Answer 2

:

From figure

$V_{\max} = \frac{100}{2} = 50 \Rightarrow V_{\min} = \frac{20}{2} = 10V$

Peak carrier voltage

$V _ { c } = \frac { V _ { \max } + V _ { \min } } { 2 } = \frac { 50 + 10 } { 2 } = 30 \mathrm {~V}$

Modulation index

Peak information voltage,

$V_{m} = \mu V_{c} = \frac{2}{3} \times 30 = 20V$