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Lemur [1.5K]
3 years ago
5

An intelligence signal is amplified by a 65% efficient amplifier before being combined with a 250W carrier to generate an AM sig

nal. If it is desired to operate at 50% modulation, what must be the dc input power to the final intelligence signal amplifier
Engineering
1 answer:
Aleks04 [339]3 years ago
3 0

Answer:

"192.3 watt" is the right answer.

Explanation:

Given:

Efficient amplifier,

= 65%

or,

= 0.65

Power,

P_c=250 \ watt

As we know,

⇒ P_t=P_c(1+\frac{\mu^2}{2} )

By putting the values, we get

        =P_c(1+\frac{1}{2} )

        =1.5 \ P_c

Now,

⇒ P_i=(P_t-P_c)

        =1.5 \ P_c-P_c

        =\frac{P_c}{2}

DC input (0.65) will be equal to "(\frac{P_c}{2} )".

hence,

The DC input power will be:

= \frac{250}{2}\times \frac{1}{0.65}

= \frac{125}{0.65}

= 192.3 \ watt

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