Question
What term specifies a filter’s attenuation inside its passband?
Answer Options
- A) Insertion loss
- B) Return loss
- C) Q
- D) Ultimate rejection
Correct Answer: A
Explanation
Any filter, whether electronic or mechanical, introduces some loss to the signal that it is supposed to pass. This loss occurs even at frequencies well within the intended operating range (the passband).
This attenuation of the desired signal inside the filter’s passband is quantified by the term insertion loss. It is usually measured in decibels (\text{dB}) and is calculated by measuring the output power relative to the input power when the filter is inserted into the circuit. Engineers always strive to design filters with the lowest possible insertion loss to maximize signal strength.
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