What circuit is required at the output of an RF switching amplifier?
The correct answer is A: A filter to remove harmonic content. What circuit is required at the output of an RF switching amplifier is a filter to remove harmonic content. Switching amplifiers generate harmonics that must be filtered. For amateur radio operators, this is important for amplifier design. Understanding this helps when designing switching amplifiers.
Exam Tip
RF switching amplifier output circuit = filter to remove harmonic content. Think 'R'F 'S'witching 'A'mplifier = 'F'ilter 'H'armonics. Switching amplifiers generate harmonics that must be filtered. Not high-pass filter, not load resistor, not temperature compensation - just filter to remove harmonics.
Memory Aid
"RF switching amplifier output circuit = filter to remove harmonic content. Think 'R'F 'S'witching = 'F'ilter 'H'armonics. Switching amplifiers generate harmonics that must be filtered. Important for amplifier design."
Real-World Application
At the output of an RF switching amplifier: A filter to remove harmonic content is required. Switching amplifiers generate harmonics due to the switching action, and these must be filtered out. This is the circuit - filter to remove harmonics.
Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. High-pass filter to compensate for low gain at low frequencies isn't required - filter to remove harmonics is required. High-pass filter isn't required.
Option C: Incorrect. Matched load resistor to prevent switching transients isn't required - filter to remove harmonics is required. Load resistor isn't required.
Option D: Incorrect. Temperature compensating load resistor isn't required - filter to remove harmonics is required. Temperature compensation isn't required.
题目解析
The correct answer is A: A filter to remove harmonic content. What circuit is required at the output of an RF switching amplifier is a filter to remove harmonic content. Switching amplifiers generate harmonics that must be filtered. For amateur radio operators, this is important for amplifier design. Understanding this helps when designing switching amplifiers.
考试技巧
RF switching amplifier output circuit = filter to remove harmonic content. Think 'R'F 'S'witching 'A'mplifier = 'F'ilter 'H'armonics. Switching amplifiers generate harmonics that must be filtered. Not high-pass filter, not load resistor, not temperature compensation - just filter to remove harmonics.
记忆口诀
RF switching amplifier output circuit = filter to remove harmonic content. Think 'R'F 'S'witching = 'F'ilter 'H'armonics. Switching amplifiers generate harmonics that must be filtered. Important for amplifier design.
实际应用示例
At the output of an RF switching amplifier: A filter to remove harmonic content is required. Switching amplifiers generate harmonics due to the switching action, and these must be filtered out. This is the circuit - filter to remove harmonics.
错误选项分析
Option B: Incorrect. High-pass filter to compensate for low gain at low frequencies isn't required - filter to remove harmonics is required. High-pass filter isn't required. Option C: Incorrect. Matched load resistor to prevent switching transients isn't required - filter to remove harmonics is required. Load resistor isn't required. Option D: Incorrect. Temperature compensating load resistor isn't required - filter to remove harmonics is required. Temperature compensation isn't required.
知识点
Circuit required, Output of RF switching amplifier, Filter to remove harmonic content
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.