Question
Download Solution PDFWhat is the order of the filter, when the gain decreases at the rate of 60dB/decade?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Low pass filter
The low pass filter only allows low-frequency signals from 0Hz to its cut-off frequency, ƒc point to pass while blocking those any higher.
This is designed with passive components in two different structures.
RC Low pass filter
RL Low pass filter
The ideal frequency response of the LPF is:
The frequency-domain analysis of the low pass filter is shown below and this is for the first order.
If the system functions contain the one pole then the change in slope will be 20 dB/decade, but in the given question the gain decreases at the rate of 60dB/decade so it means it contains the order three and poles also will be three.
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