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A modulating signal is amplified by a 80% efficiency amplifier before being combined with a 20 kW carrier to generate an AM signal. The required DC input power to the amplifier, for the system to operate at 100% modulation, would be(a) 5 kW(b) 8.46 kW(c) 12.5 kW(d) 6.25 kWI had been asked this question by my school principal while I was bunking the class.My doubt stems from Amplitde Modulation topic in section EDC Overview of Electronic Devices & Circuits |
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Answer» CORRECT answer is (c) 12.5 KW The best I can explain: Pi = PT -Pc = 30 – 20 = 10 kW. DC input = 10/0.8 or 12.5 kW. |
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