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» There is no isolation b/w input and output.

» These circuits can not provide any gain.

» There is always someloss of signal, It can be in the passband.

» Circuit becomes bulky if inductors are used.

» There is no clear demarcation between Passband and stopband but actually it (Passband & Stopband) get mixed up.

» In this frequency response is not sharp as no sudden change in the output when switching from passband to stopband.

» Source loading can take place.

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Q: What are the disadvantages of passive filters?
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