The INA does not work properly with square-wave input signals.

Hi IdrisWani ,

Good day. Can you check the characteristics of your probe? The probe that you use to measure could have a capacitive loading that could add up to your measurement. Also, this could be due to parasitics in your PCB design. Can you measure the parasitics along the copper trace of your PCB layout? Thanks.

Regards,
Gilbeys

That was my initial approach as well, so buffered the output using a OP07 still same. However, the LTC6373 EVM Documentation states that the 180 pF cap on PIN 9 is optional and that seems to be doing the trick. 

Hi,

Set DC coupling for the green and orange channels:

AC coupling typically causes such waveforms at low frequencies. Alternatively you can apply higher frequency.

Zoltan

Thankyou Zoltan. But I did it with DC Coupling as well; but did not make much difference.  

Hi,

Try to check it at higher frequencies, say 1kHz or above.

Zoltan

Hi IdrisWani,

I tried the setup you provided on a bench and got the same charging and discharging pattern. 

I was able to resolve the issue by changing AC to DC coupling on oscilloscope for both channels.

Possible reason for the charging and discharging pattern is the capacitive loading of the AC coupling on your measuring device.

This is what I did finally to check the effect of 180 pF cap on pin 9, and it works fine for both configurations.