how to read Vp-p 40 volt sine wave on pic18f452 A2d

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Dear all,
we built an electromagnetic sensor that can sense the change in its surrounding magnetic field. the sine wave signal o/p is 40volt
we tried alot of ics like opamps but we face a saturation problem at 100khz we don't know why!. is there any other solution to read the change in the amplitude in the incoming signal?

Thanks
 

You can try to use voltage devider network for down sccling the voltage and external fast sampling ADC for reading the value of voltage and also feed to micro-controller based on some logic that you want to get voltage reading from Micro-controller

Good Luck
 


The higher voltage problem may require suitable voltage divider (may be 1:8 or 1:10 ratio).
It is sine wave, it may require dc level shifting depending on the characteristics of ADC on chip ADC can be used with offset.
The frequency issue seems to be related to the opamp like components considered / used.
 
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