Question
Download Solution PDFA 240 kHz, 10 Vpp carrier is amplitude modulated using a 1 kHz sine wave of 3 Vpp. What is the modulation index?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Amplitude Modulation:
The amplitude of the carrier is varied according to the amplitude of the message signal.
Modulation index:The modulation index is a measure of the extent of modulation done on a carrier signal. In Amplitude modulation, it is defined as the ratio of the amplitude of the modulating signal to that of the carrier signal.
Calculation:
Given,
Message Signal frequency, fm = 1 kHz
Carrier frequency, fc = 240 kHz
Peak Voltage of the message signal, Am = 3 V
Peak Voltage of the carrier wave, Ac = 10 V
The modulation index is given by,
∴ The correct option is 2.
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