What are the principal frequencies that appear at the output of a mixer circuit?

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Multiple Choice

What are the principal frequencies that appear at the output of a mixer circuit?

Mixers are nonlinear devices that combine two signals. When you multiply two sinusoidal signals, the output naturally contains frequencies that are the sums and differences of the input frequencies. In a perfect mixer, those are the main products you’d expect. In real hardware, you can also see leakage of the original input frequencies at the output due to imperfect isolation, which is why the original frequencies may appear alongside the sum and difference. Therefore, the principal frequencies at the output are the original frequencies and their sum and difference.

Mixers are nonlinear devices that combine two signals. When you multiply two sinusoidal signals, the output naturally contains frequencies that are the sums and differences of the input frequencies. In a perfect mixer, those are the main products you’d expect. In real hardware, you can also see leakage of the original input frequencies at the output due to imperfect isolation, which is why the original frequencies may appear alongside the sum and difference. Therefore, the principal frequencies at the output are the original frequencies and their sum and difference.

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