Active filter with gain

Piotr Wyderski · 2017-07-26T07:54:47+00:00

Dear all, I need an as high order as possible filter for ~80kHz small signals with good phase linearity (don't care much about the amplitude response flatness). My current choice is to use LTC1562-2 in an 8th order Bessel filter configuration with 5V single supply. The problem is that I also need some gain (36dB looks good) and FilterCAD allows me to enter this value. But how well does this simulation matches reality? Most of the filters I've ever seen are of unity gain and I believe there is a good reason for that. Should I expect oscillations or other forms of instability? Best regards, Piotr

Jul 26, 2017 60 Replies

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pcdhobbs 9 years ago

Absolutely, if you have one already.

Cheers

Phil Hobbs

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