What causes intermodulation in an electronic circuit?
The correct answer is C: Nonlinear circuits or devices. What causes intermodulation in an electronic circuit is nonlinear circuits or devices. Nonlinearity creates IMD products. For amateur radio operators, this is important for understanding IMD. Understanding this helps when troubleshooting interference.
Exam Tip
Intermodulation cause = nonlinear circuits or devices. Think 'I'ntermodulation = 'I'nterference from 'N'onlinearity. Nonlinearity creates IMD products. Not negative feedback, not lack of neutralization, not positive feedback - just nonlinear circuits.
Memory Aid
"Intermodulation cause = nonlinear circuits or devices. Think 'I'ntermodulation = 'N'onlinearity. Nonlinearity creates IMD products. Important for understanding IMD."
Real-World Application
Intermodulation in an electronic circuit: It's caused by nonlinear circuits or devices. When a circuit is nonlinear, it can mix signals and create intermodulation products. Linear circuits don't create IMD. This is the cause - nonlinear circuits or devices.
Key Concepts
Why Other Options Are Wrong
Option A (Negative feedback): Incorrect. Negative feedback reduces nonlinearity, doesn't cause IMD - nonlinear circuits cause IMD. Negative feedback isn't the cause.
Option B (Lack of neutralization): Incorrect. Lack of neutralization causes oscillation, not IMD - nonlinear circuits cause IMD. Neutralization isn't the cause.
Option D (Positive feedback): Incorrect. Positive feedback causes oscillation, not IMD - nonlinear circuits cause IMD. Positive feedback isn't the cause.
题目解析
The correct answer is C: Nonlinear circuits or devices. What causes intermodulation in an electronic circuit is nonlinear circuits or devices. Nonlinearity creates IMD products. For amateur radio operators, this is important for understanding IMD. Understanding this helps when troubleshooting interference.
考试技巧
Intermodulation cause = nonlinear circuits or devices. Think 'I'ntermodulation = 'I'nterference from 'N'onlinearity. Nonlinearity creates IMD products. Not negative feedback, not lack of neutralization, not positive feedback - just nonlinear circuits.
记忆口诀
Intermodulation cause = nonlinear circuits or devices. Think 'I'ntermodulation = 'N'onlinearity. Nonlinearity creates IMD products. Important for understanding IMD.
实际应用示例
Intermodulation in an electronic circuit: It's caused by nonlinear circuits or devices. When a circuit is nonlinear, it can mix signals and create intermodulation products. Linear circuits don't create IMD. This is the cause - nonlinear circuits or devices.
错误选项分析
Option A (Negative feedback): Incorrect. Negative feedback reduces nonlinearity, doesn't cause IMD - nonlinear circuits cause IMD. Negative feedback isn't the cause. Option B (Lack of neutralization): Incorrect. Lack of neutralization causes oscillation, not IMD - nonlinear circuits cause IMD. Neutralization isn't the cause. Option D (Positive feedback): Incorrect. Positive feedback causes oscillation, not IMD - nonlinear circuits cause IMD. Positive feedback isn't the cause.
知识点
Intermodulation, Electronic circuit, Nonlinear circuits or devices, IMD cause
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.