Ultrasonic piezoceramic transducer modeling with VHDL-AMS IEEE 1076.1

This paper presents an ultrasonic transducer modeling with VHDL-AMS IEEE 1076 integrated in a global measurement cell modeling dedicated to biological ultrasound characterization. Conventional modeling of ultrasonic transducer is based on electrical analogy and is not simulated in the global measurement environment. The ultrasonic transducer modeling proposed is simulated with the nonlinear acoustic load and electronic excitation. The transducer is a piezoceramic element vibrating in thickness mode. The theoretical equations of piezoelectricity are used to determine a matrix transfer which describes the relation between the electrical and the acoustical parts. The temporal implementation is based on the Redwood´s model. Characterization of different mediums like water and ethanol with a compared method is based on the B/A ultrasonic parameter estimation. The good results obtained for temporal simulation and B/A nonlinear parameter estimation compared to measurements show that we can extended to a multi-layer characterization with an ultrasonic nonlinear imaging probe modeling.