Which filter type has ripple in the passband and a sharp cutoff?
The correct answer is D: A Chebyshev filter. Which filter type has ripple in the passband and a sharp cutoff is a Chebyshev filter. Chebyshev filters have passband ripple but sharp cutoff. For amateur radio operators, this is important for filter design. Understanding this helps when selecting filters.
Exam Tip
Filter with passband ripple and sharp cutoff = Chebyshev filter. Think 'C'hebyshev = 'C'heap (ripple) but 'S'harp cutoff. Chebyshev filters have passband ripple but sharp cutoff. Not Butterworth (flat passband), not active LC, not passive op-amp - just Chebyshev.
Memory Aid
"Filter with passband ripple and sharp cutoff = Chebyshev filter. Think 'C'hebyshev = 'R'ipple + 'S'harp cutoff. Chebyshev filters have passband ripple but sharp cutoff. Important for filter design."
Real-World Application
A filter type with ripple in the passband and a sharp cutoff: It's a Chebyshev filter. Chebyshev filters trade flat passband response for sharper cutoff. This is the type - Chebyshev filter.
Key Concepts
Why Other Options Are Wrong
Option A (Butterworth filter): Incorrect. Butterworth has flat passband, not ripple - Chebyshev has ripple. Butterworth isn't the type.
Option B (Active LC filter): Incorrect. Active LC filter isn't a specific filter type - Chebyshev is the type with ripple. Active LC isn't the type.
Option C (Passive op-amp filter): Incorrect. Passive op-amp filter is contradictory - Chebyshev is the type with ripple. Passive op-amp isn't the type.
题目解析
The correct answer is D: A Chebyshev filter. Which filter type has ripple in the passband and a sharp cutoff is a Chebyshev filter. Chebyshev filters have passband ripple but sharp cutoff. For amateur radio operators, this is important for filter design. Understanding this helps when selecting filters.
考试技巧
Filter with passband ripple and sharp cutoff = Chebyshev filter. Think 'C'hebyshev = 'C'heap (ripple) but 'S'harp cutoff. Chebyshev filters have passband ripple but sharp cutoff. Not Butterworth (flat passband), not active LC, not passive op-amp - just Chebyshev.
记忆口诀
Filter with passband ripple and sharp cutoff = Chebyshev filter. Think 'C'hebyshev = 'R'ipple + 'S'harp cutoff. Chebyshev filters have passband ripple but sharp cutoff. Important for filter design.
实际应用示例
A filter type with ripple in the passband and a sharp cutoff: It's a Chebyshev filter. Chebyshev filters trade flat passband response for sharper cutoff. This is the type - Chebyshev filter.
错误选项分析
Option A (Butterworth filter): Incorrect. Butterworth has flat passband, not ripple - Chebyshev has ripple. Butterworth isn't the type. Option B (Active LC filter): Incorrect. Active LC filter isn't a specific filter type - Chebyshev is the type with ripple. Active LC isn't the type. Option C (Passive op-amp filter): Incorrect. Passive op-amp filter is contradictory - Chebyshev is the type with ripple. Passive op-amp isn't the type.
知识点
Filter type, Ripple in passband, Sharp cutoff, Chebyshev filter
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.