Abstract
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.
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References
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© 2011 Springer-Verlag Berlin Heidelberg
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Li, N. et al. (2011). High Accuracy Dynamic Adjusting Voltage Source for Cell Impedance Tomography Application. In: Lee, G. (eds) Advances in Automation and Robotics, Vol. 2. Lecture Notes in Electrical Engineering, vol 123. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-25646-2_36
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DOI: https://doi.org/10.1007/978-3-642-25646-2_36
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-25645-5
Online ISBN: 978-3-642-25646-2
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