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?
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?