Question
What causes intermodulation in an electronic circuit?
Answer Options
- A) Negative feedback
- B) Lack of neutralization
- C) Nonlinear circuits or devices
- D) Positive feedback
Correct Answer: C
Explanation
Intermodulation (IM) is the generation of spurious output signals when two or more distinct input frequencies are present in a device. The new, unwanted signals (IMD products) are mathematical combinations of the input frequencies. This effect is a universal characteristic of certain types of electronic processing.
Intermodulation is fundamentally caused by nonlinear circuits or devices. If an amplifier or mixer operates outside its linear range, the mathematical relationship between the input and output is no longer a simple scalar multiplication, leading to the generation of spurious frequencies. Preventing IMD requires ensuring all critical stages in a receiver or transmitter operate strictly within their specified linear range.
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