4. A 45-MHz sine-wave signal is fed into an amplifier. What are its first four h

Question

4. A 45-MHz sine-wave signal is fed into an amplifier. What are its first four harmonic frequencies? 5. A 91-MHz (frequency A) and a 94-MHz (frequency B) signal are applied together, at the same amplitude, to the input of an RF amplifier. Identify the six intermodulation frequency products (A + B, B-A, 2A B, 2A- B, 2B + A, 2B -A): (a) 40.5 MHz, 47 MHz, 182 MHz, 188 MHz, 273 MHz, 282 MHz (b) 3 MHz, 88 MHz, 97 MHz, 185 MHz, 276 MHz, 279 MHz 6. Does the amplifier above with the single-frequency input at 45-MHz have any intermodulation components at its output? Why or why not? 7. Besides an amplifier, name two other circuit elements (not necessarily active) that can generate both harmonic and intermodulation products? 8. Which type of mixer is commonly used when frequency conversion or frequency translation is needed? 9. What is the purpose of the filter at the output of a mixer? 10. In an FM receiver, whose IF output is 10.7 MHz, 111.4-MHz is applied to the LO port. What is the RF signal we are trying to receive?

Explanation / Answer

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          Please find the answer attached as under. Please give a thumbs up rating if you find the answer useful! Have a rocking day ahead!
I will be answering only the first question. The answer is as below:

1. An amplifier is always a linear system. It supplies gain depending on the freqency input of the signal. Thus, whatever is the frequency of the input, the frequency of the output is the same as that of the input. Thus, if a 45Mhz sine wave is input to the amplifier, it will only have a fundamental component at 45Mhz. All its harmonic components will be zero.

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