Question
What process combines two signals in a non-linear circuit to produce unwanted spurious outputs?
Answer Options
- A) Intermodulation
- B) Heterodyning
- C) Detection
- D) Rolloff
Correct Answer: A
Explanation
When two or more signals are combined in a non-linear electronic component (such as an overdriven amplifier or a poorly designed mixer), the mixing process creates new, spurious signals that were not present in the input. This unwanted mixing phenomenon is called intermodulation (IMD).
The spurious outputs, called intermodulation products (IM products), often fall close to the original signal frequencies, resulting in unwanted noise and interference (splatter). Avoiding or reducing IMD is a major goal in high-quality amplifier and receiver design, typically achieved by ensuring all circuits operate within their linear region.
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