Abstract
The main challenge in designing an interface circuit for capacitive displacement sensors with sub-nanometer resolution is the large offset capacitance of the sensor. This offset capacitance is a result of the relatively large distance between the sensor electrodes, compared with the displacement range to be measured. From the different methods with which to interface capacitive sensors, a charge-balancing technique is used here to demonstrate a power-efficient way to remove the offset, while maintaining high resolution and short conversion time. As an example, the design of an oversampling capacitance-to-digital (CDC) converter based on a third order sigma/delta modulator is presented.
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.
