Hello, I am building an analog signal conditioning board for which the front end is the INA163, I am trying to create a "shelf-filter" type of response with a 22 nF in series with a 680 Ohm resistor, with a 2.2 nF in parallel again, in each feedback loop of the INA163 (between pins 1 to 3 and pins 14 to 12). However, this produces a very unstable, distorted and noisy (high frequency hash) output from the INA163. Even just trying to put a single 22nF cap in each feedback loop to cause a first order roll-off at ~ 2.4 kHz (22 nF in parallel with a 3000 Ohm) results in the same noisy output, although not as bad as the first case mentioned.
My signal characteristics are such that low frequency signals (1 Hz to 500 Hz) are ~ 5 times smaller than high frequency signals (5 kHz to 20 kHz), so I would like to use more gain at low frequency, and less at high, if possible.
Does anyone know the correct way to bandwidth limit the gain response of the INA163 ?
Thank you very much,
David
