What will be the figure of merit or quality factor (Q) for a band-pass filter to be wide?

Q.  What will be the figure of merit or quality factor (Q) for a band-pass filter to be wide?
- Published on 23 Oct 15

a. Greater than 10
b. Less than 10
c. Equal to 10
d. None of the above

ANSWER: Less than 10
 
Narrow & Wide band-pass filters can be distinguished only on the basis of quality factor. This figure of merit conveys that if 'Q' > 10, the filter is considered to be a narrow band-pass filter whereas if 'Q' < 10, then the filter is considered as a narrow band-pass filter. Therefore, quality factor is a measure of selectivity which infers that the selectivity of the filter depends on the value of 'Q'. Higher the value of quality factor, more is the selectivity of the filter.

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