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High-Pass filtering of AD8232

Question asked by tom.whiting on Sep 15, 2017
Latest reply on Sep 15, 2017 by jrombola

Hello,

 

I'm currently looking at a product that uses the AD8232 with the high-pass filtering configuration described in the datasheet Figure 56 i.e. an alternative two-pole high-pass filter using C2 and Rcomp.

 

I would like to generate the transfer function for this section of filtering to understand it further, but I'm struggling to figure out how to derive this and hence how the cutoff frequency becomes = 10 / (2pi (sqrt(R1xC1xR2xC2)) as stated on page 22 of datasheet.

 

I've attached a re-drawn diagram to try and understand this circuit, but please give any comments.

 

Any help would be much appreciated!

 

Tom

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