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decreasing gain of a low pass filter

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ND_basic

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i have designed a low pass filter to be implemented on an IC with cut off freq at 200 Hz.... its a gm-C filter...
however the response shows a gain of around 45dB.... is there anyway i can decrease this to 0dB....??
Also what does having a gain of 50dB mean... with regard to the operation of the filter...?
 

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