Charge Amplifier

Thread Starter

Mahathi Anand

Joined Jun 3, 2015
20
Hello.
I have been assigned to build a charge amplifier circuit for a piezoelectric sensor required for detecting human pulse. I have several doubts regarding this.

Im using OPA277 for this and initially I have been trying to build a normal amplifier/integrator circuit. In spite of trying it several times, the output doesnt come right. The value of gain/frequency response aint depending upon the resistor/capacitor value I choose...
Also, an integrator is supposed to behave as a low pass filter, however, Im able to see high pass characteristics, with a cut off of about 5KHz for any resistor/capacitor value.
Could you please help me out?
 

OBW0549

Joined Mar 2, 2015
3,566
We really cannot help you much until you post a COMPLETE schematic, including all component values. Also, it would help to have a link to the product spec (datasheet) of the piezoelectric sensor you plan on using, so we can assess the component value choices you have made.
 
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