To make the question clear I will ask this with an example.
Let's say we have a LP filter with a -3dB attenuation at cutoff frequency of 1kHz. And lets say we are given the steepness of the filter as 100 dB/decade.
Does that mean the filter will attenuate 100 dB/decade right after -3dB point?
If so, the following possibilities for Bode plot points confuses me when I try to use dB/decade definition:
-103 dB at 10 kHz? or
-100 dB at 10 kHz? or
-100 dB at 11 kHz? or
-103 dB at 11 kHz? or
Which one of the above is exactly correct according to the definition dB/decade? What confuses me is should we take decade as multiplication or addition to the cut off frequency? And should we go down from -3dB or zero for the attenuation?