Abstract
The principle, design, and measurement of a 10-A highly stable dc current source is described. Based on a modified low-frequency equivalent model of the MOSFET, we obtain the strict current equation of the MOSFET-based voltage-controlled current source. Factors determining the current stability are investigated and reasonable selection criteria for the key components are discussed. Reasons for oscillation due to the high parasitic capacitance of the paralleled MOSFETs with low set of drain–source voltage are explained and a combined noise gain and lead compensation method is proposed. The best measurement results show that the relative standard deviation and relative drift of the current in 1 h are, respectively, $7.5 \times 10^{-8}$ and $2.2 \times 10^{-8}$ . The current source has been used in our high-current meter stability evaluation experiments and can be used for other cases with appropriate improvement, such as the Joule Balance Project to redefine the kilogram at National Institute of Metrology.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: IEEE Transactions on Instrumentation and Measurement
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
