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In MEMS realization of high frequency ultrasonic array transducer, electrical impedance matching may become difficult for the reason of the miniaturization of the piezo-array elements. In this study, the electrical impedance of the array elements is estimated first by using KLM model, and then calculated by using finite elements method (FEM), in the case of a LiNbO3 based 30MHz array transducer. The...
In this paper, a Bayes filter is adapted to determine environmental variation using ship noise data measured on a vector sensor. As compared to batch processing approaches, the Bayesian framework can monitor ocean processes or environments that substantially vary in time or space. The use of vertical impedance (a ratio of pressure and vertical particle velocity) is emphasized here, which is shown...
In coastal areas, the properties of the soft sediment are crucial for sound propagation prediction and relevant sonar applications. The noise of intense ship traffic is a convenient acoustic source in these areas for geoacoustic characterization. This paper introduces a sequential particle filter (PF) technique that can take advantage of the continuous ship sound field to predict the soft sediment...
For high-accuracy digital-to-analog converter (DAC), delay difference depending on output voltage is one of the major nonlinearities that deteriorate the dynamic performance. In this paper, an improved output-dependent delay cancellation (ODDC) technique is proposed. The proposed ODDC is implemented in simple circuit architecture and has advantages of significant improvement on the dynamic performance...
In this paper, an output-dependent delay cancellation (ODDC) technique is proposed. For a high-accuracy digital-to-analog converter (DAC), the delay differences caused by output voltage is one of the major nonlinearities that deteriorate the dynamic performance. The ODDC technique has the advantages of significant improvement on the dynamic performance in a wide frequency range without increasing...
This paper is concerned with the design of a high speed current steering DAC. Techniques to improve static precision are preserved while their negative influences on dynamic performance are suppressed. The prototype is implemented with the SMIC 0.13 ??m process. With an update rate of 700 Msamples/s, measurements show that the DAC achieves over 40 dB SFDR under a sampling rate of 700 Ms/s and consumes...
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