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regarding noise in output of differential configuration of amplifier{OPA197}

Shubhendra Singh
Intellectual 855 points
Other Parts Discussed in Thread: OPA197

i am switching voltage levels of 32 channel  of a 32 channel multiplexers with the switching speed 20 ms/channel. The range of voltage is 0v to 15 volt..

 1st Stage:   then after i am passing voltage level through  unity gain buffer stage [OPA197]. 2nd Stage then after to reduce the voltage i am using OPA197 in differential configuration.

problem.

1) after unity gain stage i have 40 mV peak to peak noise(HIGH FREQUENCY) in my dc voltage level.
 but after deferential amplifier stage it increase to 200 mV peak to peak.


i tried to sort it out using a low pass filter but fail.

here below is my circuit

one thing i observed that the noise is more in low voltage levels such as 200mV 150 mV