Low capacitance (tens of pF) piezopolymeric transducers used in SHM systems are usually connected to electronic front-end by cables which parasitic capacitance is comparable to the transducer one. To avoid signal attenuation due capacitance partitioning occurring with high impedance voltage amplifiers, a novel architecture of a fully differential charge amplifier is proposed. The -3dB band of interest for this design is 100 kHz-1MHz. The electronic design carried out by simulations is presented, and then experimentally verified. A 245dB [V/C] measured conversion gain, is particularly suitable for preamplification of very small amount of charge (~ fC), and a theoretical differential input impedance lower than 140Ω on the whole band. A common mode rejection ratio of 60dB and 50dB has been obtained for the variants with active and resistive loads of the differential amplifier respectively.
Design, Realization and Characterization of a Differential Charge Amplifier for Ultrasonic Piezopolymer Transducers / Capineri L.; Giannelli P.; Calabrese G.; Granato M.; Frattini G.. - ELETTRONICO. - 2018-:(2018), pp. 1-5. (Intervento presentato al convegno 2018 IEEE International Ultrasonics Symposium, IUS 2018 tenutosi a jpn nel 2018) [10.1109/ULTSYM.2018.8580095].
Design, Realization and Characterization of a Differential Charge Amplifier for Ultrasonic Piezopolymer Transducers
Capineri L.
Supervision
;Giannelli P.Conceptualization
;Calabrese G.Validation
;
2018
Abstract
Low capacitance (tens of pF) piezopolymeric transducers used in SHM systems are usually connected to electronic front-end by cables which parasitic capacitance is comparable to the transducer one. To avoid signal attenuation due capacitance partitioning occurring with high impedance voltage amplifiers, a novel architecture of a fully differential charge amplifier is proposed. The -3dB band of interest for this design is 100 kHz-1MHz. The electronic design carried out by simulations is presented, and then experimentally verified. A 245dB [V/C] measured conversion gain, is particularly suitable for preamplification of very small amount of charge (~ fC), and a theoretical differential input impedance lower than 140Ω on the whole band. A common mode rejection ratio of 60dB and 50dB has been obtained for the variants with active and resistive loads of the differential amplifier respectively.File | Dimensione | Formato | |
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