How to measure the filter roll-off rate

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SUMMARY

The discussion focuses on measuring the filter roll-off rate in decibels per decade using a filter response graph generated in micro-Cap. The cutoff frequency specified is 1 kHz. Participants emphasize the importance of determining the number of decades the graph extends beyond the cutoff frequency and calculating the total dB drop over those decades to accurately assess the roll-off rate. A formula for calculating the roll-off rate is sought, indicating a need for precise measurement techniques.

PREREQUISITES
  • Understanding of filter response graphs
  • Familiarity with micro-Cap simulation software
  • Knowledge of cutoff frequency concepts
  • Basic principles of decibel calculations
NEXT STEPS
  • Research the formula for calculating filter roll-off rate in dB/Decade
  • Explore advanced features of micro-Cap for filter analysis
  • Study the impact of different filter types on roll-off characteristics
  • Learn about frequency response measurement techniques
USEFUL FOR

Electronics engineers, audio engineers, and anyone involved in filter design and analysis will benefit from this discussion.

fran1942
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Hello, I have taken the attached filter response graph of filter gain to frequency created in micro-Cap. My cutoff frequency is 1kHz.
How can I measure the roll off rate in db/Dec based on this graph ?
Perhaps there is a formula ?
Any help would be appreciated.
 

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  • roll.jpg
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How many decades does your graph run for after the cutoff frequency? How many dB does it drop over those decades?
 

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