Abstract
Current source is one of the key components in electrical measurement and control systems. However, the noise introduced by temperature drift and other interference makes it a significant source of systematic errors. To develop a high precision and stable current source, a Howland-based voltage to current conversion (V/I) circuit is presented in this paper. The current source is fully programmable using a DSP via RS-232 interface. Moreover, a sampling circuit is provided, using the sampling results, calibration is made to further reduce the output error of the current source. Under a constant 140 Omega load, experiment results shows that current output ranges from -50 mA to +50 mA with error less than 3 muA, and features low temperature drift and distortion. This proves that such design can be an effective way to provide a precise and stable range output current.
Sign-in/Register to access full text options 
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 callDisclaimer: 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.
