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We are also able to analyze the specifications what happens signal conditioning by using charge amplifier. A signal-conditioning circuit must have low imput impedance but piezoelectric transcuder have high input impedance which is bad thing. A typical input impedance for piezoelectric transducer is 3500 kΩ but it varies in different piezoelectric models.
The pressure sensor input variants about the pressure, temperature and material.
The signal may need amplification so there has to be an amplifier added.
The input bias currents of this type of amplifier is usually below 100 pA, it should be fine as long as the feedback resistor value is below 1 GΩ.
Specified excitation voltage for all standard ICP sensors and amplifiers is generally within the range of 18 to 30 volts.
The signal is converted to digital signal with an A/D converter. It is placed usually in somekind of an embedded system outside of the sensor. The sensor only reacts to pressure changes.
The system has some output noise which is approximately some hundreds of nV/sqrt(Hz). Noises are coming from voltage and current.
The sensor is statically calibrated.
Sources
http://www.engineersgarage.com/articles/pressure-sensors-types-working
http://www.sensorsmag.com/sensors/pressure/fundamentals-pressure-sensor-technology-846
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