2012 | OriginalPaper | Buchkapitel
High Accuracy Dynamic Adjusting Voltage Source for Cell Impedance Tomography Application
verfasst von : Nan Li, Hui Xu, Yang Yang, Jietao Diao, Hongshan Nie, Hongqi Yu, Haijun Liu
Erschienen in: Advances in Automation and Robotics, Vol. 2
Verlag: Springer Berlin Heidelberg
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This paper presented a high accuracy voltage source with current limiting function. A high-speed (250 MHz), high-resolution (16 bit) dual DAC is used for generating stimulate voltage by DDS technique. The amplitude of source could be adjusted by wide bandwidth, low noise variable gain amplifiers from -11 to +51 dB. The 4-Opamp architecture is applied to realize a high gain, high-accuracy variable gain instrument amplifier circuit for tiny current sensing. By using analog comparator to convert over-current time into length of digital pulse, the FPGA could monitor the amplitude of current in real-time. Evaluation results show that system has good SFDR performance and fast response speed. With the advantages of accuracy and bandwidth, it is suitable for cell impedance tomography application.