PROBLEM IN DESIGNING HIGH PASS FILTER USING OTA

ROSSI69

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I am designing a high pass filter using ota i am not getting the correct output can anyone please suggest me where i am doing wrong i first applied input Vc and also applied the dc offset at Vc only but i was not able to get the result then i applied the dc offse[/USER]t @ non inveting input of 2nd ota i was able to get the output my doubt is how do you know where to apply the dc offset so all devices remain in saturation

 
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I'm not sure what your intended output is but the feedback and coupling paths are probably supposed to be RC networks but yours are missing the 'R's.
Placing 100uF capacitors as loads on any amplifier is asking fro trouble.

Brian.
 

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Would be helpful to have a description of the original circuit clarifying the role of Va, Vb and Vc and expected transfer function. LTspice circuit has two errors:
V4 is shorting X2 output. X2.Vin1 is setting DC bias for filter and must not be grounded but but connected to DC source. You may want to place V4 here.
@betwixt: gm-C filters usually work without R. Connecting large C to output is no problem (if appropriate for the respective filter function), OTA output is high impedance.
 

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