wildcard96
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Hi,
iam currenty on a design for a piezo transducer (Cs~4,5nF) and want to amplify the output in the (audio) frequency range of 10Hz to 10kHz.
Total Gain is just about 4...10. Supply Voltage +-4V
The output has to be transmitted differential over a longer distance (~100m-500m) into a 20kOhm load (audio adc) - so i expect a worst case of 100nF cable capacitance to drive. The new OPA-192 is selected because of it low Ib and high cap drive.
By now i figured out three different versions for my amplifier:
a) Noninverting Amp (G=4) + Noninverting Amp (G=2/2=1) + inverting Amp (G=1)
b) Noninverting Amp (G=4) + inverting Amp (G=1)
c) instrumentation amp from two discrete opamps (G=4) + inverting Amo (G=1)
Which option would you prefer and why?
Thanks!
iam currenty on a design for a piezo transducer (Cs~4,5nF) and want to amplify the output in the (audio) frequency range of 10Hz to 10kHz.
Total Gain is just about 4...10. Supply Voltage +-4V
The output has to be transmitted differential over a longer distance (~100m-500m) into a 20kOhm load (audio adc) - so i expect a worst case of 100nF cable capacitance to drive. The new OPA-192 is selected because of it low Ib and high cap drive.
By now i figured out three different versions for my amplifier:
a) Noninverting Amp (G=4) + Noninverting Amp (G=2/2=1) + inverting Amp (G=1)
b) Noninverting Amp (G=4) + inverting Amp (G=1)
c) instrumentation amp from two discrete opamps (G=4) + inverting Amo (G=1)
Which option would you prefer and why?
Thanks!
