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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...
For an LCC–MMC hybrid HVDC transmission system with reverse current blocking diodes, this paper presents a method for dc-side harmonic current calculation and dc-loop impedance calculation. First, in the calculation of dc-side harmonic currents, the line-commutated converter at the rectifier side is replaced by the three-pulse harmonic voltage sources; the modular multilevel converter is represented...
Time Domain Reflectometry (TDR) has been introduced into the design of X-band tile Transmit/Receive (T/R) modules fabricated with Low Temperature Co-fired Ceramics (LTCC) processing. TDR simulation exhibits additional capability compared with S-parameter simulation, especially in the aspect of vertical interconnection scheme. Vertical quasi-coax interconnection and wire bonding schemes have been explored...
Electrical impedance tomography (EIT) is believed to be a distinctive imaging technology and have good prospect in the field of biomedical testing. A multi-channel electrical impedance measurement system using DSP is studied. It includes four modules: excitation source, electrode array, signal acquisition, and signal processing. The results in experiment demonstrate that the system can distinguish...
This paper presents a design of a phase-sensitive detector based on matched filter principles and implemented using digital signal processing (DSP) technology for electrical impedance tomography (EIT) system. The digital phase-sensitive detector (DPSD) was realized with DSP, field programmable gate array (FPGA) chips and other analog circuits. The sampling pulse controlling the analog-to-digital converter...
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