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A test and measurement system for the characterization of standard 32 kHz tuning fork crystal based sensors is proposed. A very simple circuit configuration provides for a white noise voltage test signal to be applied to the tuning fork device and to a variable capacitor that, in combination with a differential transimpedance amplifier, allows to detect and amplify the current through the device subtracting...
The noise performances of monolithic operational amplifiers are generally insufficient for the realization of low noise amplifiers for applications in the field of low frequency voltage noise measurements. In order to obtain very low levels of equivalent input voltage and current noise, discrete JFETs input stages can be used, with the disadvantage of introducing a large input capacitance that can...
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