Question
What term specifies a filter’s maximum ability to reject signals outside its passband?
Answer Options
- A) Notch depth
- B) Rolloff
- C) Insertion loss
- D) Ultimate rejection
Correct Answer: D
Explanation
A filter must not only pass the desired frequencies with low loss but must also effectively block unwanted frequencies that fall far outside its intended passband. The measure of this blocking capability is its rejection.
The term ultimate rejection specifies the filter’s maximum ability to reject signals outside its passband. It is measured in decibels (\text{dB}) and indicates the greatest amount of attenuation (minimum power transmission) that the filter provides at frequencies far removed from its cutoff frequency, often showing the filter’s deepest, most complete attenuation.
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