Define roll of rate and order of filter.

Define roll of rate and order of filter.
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1 Answer

Answer :

1. Roll of rate is the rate of change of gain with frequency. Roll of rate is always measured in dB/decade.

2. The roll of rate is called the order of the filter.

It depends on the rate at which filter‟s gain changes with frequency.

For example:

i) If roll off rate is -20 dB / decade or +20 dB / decade then the filter is of 1st order.

ii) If roll of rate is -40 dB / decade or +40 db / decade then the filter is of 2nd order and so on


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