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Charge Amplifier
for High Bandwidth Piezo-electric Sensors/Elements |
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Niksar Australia was commissioned to
design a low noise wide-band charge amplifier by one of its customers.
Four channels were required in the unit with settable gains between -20 and
+20 dB with an element capacitance range of 0.1 nF - 24.32 nF. The nominal
bandwidth of the amplifier is 2 MHz. Self-noise was to be kept low and is
specified as 3 uVrms in a 50 kHz bandwidth. This unit was to be used at
various sites for transient signals and therefore had to be amenable
to battery powered operation. The performance specification
gives more details. |
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Internal view showing the four independent
channels circuits
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Front view showing the four channels'
input-output connections |
| The product was designed assembled and tested at Niksar and met all the
requirements of the customer. It has application for a variety of
applications that use piezoelectric sensing elements or transducers where
wide bandwidth is required. |
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SYSTEM DESIGN AND INTEGRATION 
