Differential load amplifier for piezoelectric sensors
AssigneeSociete Nationale d'Etude et de Construction de Moteurs d'Aviation "S.N.E.C.M.A."
InventorJoel Marc Vanoli
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Abstract
A differential load amplifier for receiving two measurement currents from a differential piezoelectric sensor and outputting a voltage proportional to a useful signal measured by the sensor. The differential load amplifier includes a subtraction device for determining a difference signal between the two measurement currents received from the sensor, and an integration device including and an integration capacitor for integrating the difference signal determined by the subtraction device. The subtraction device includes a negative immitance impedance converter, and the integration device includes an operational amplifier connected as an integrator. The subtraction and integration devices may also be implemented by a differential current amplifier and an integration capacitor, respectively.
Claims8
A differential load amplifier for receiving first and second measurement currents output from a differential piezoelectric sensor, said differential load amplifier comprising:
- subtraction means, having first and second inputs for receiving said first and second measurement currents, respectively, said subtraction means providing, at said first input, a difference current representing a difference between said first and second measurement currents;
- and
- integration means for integrating said difference current, and having an input and an output for respectively receiving said difference current and delivering an output voltage proportional to said difference current.
Dependencies are inferred from the claim text.