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A ± 3 ppm/°C Single-Trim Switched Capacitor Bandgap Reference for Battery Monitoring Applications.
- Source :
-
IEEE Transactions on Circuits & Systems. Part I: Regular Papers . Apr2017, Vol. 64 Issue 4, p777-786. 10p. - Publication Year :
- 2017
-
Abstract
- A precision bandgap reference has been developed in a 0.18~\mu \text m BiCMOS process that achieves ±3 ppm/°C temperature drift at ±3 $\sigma $ from −40 °C to 110 °C. The reference is designed to utilize single temperature trim and standard components. A 3.65 V switched capacitor reference voltage is provided to a $2^{{\textrm {nd}}} order delta-sigma modulator ADC to digitize a battery cell voltage. The switched capacitor reference utilizes fully differential sampling which reduces the errors from channel charge injection and clock feedthrough introduced by pseudo-differential sampling. A new technique for sampling a \text V{\textrm {be}} voltage directly onto the output of the reference’s differential amplifier has been developed that removes the error that would be introduced from differentially sampling the \text V{\textrm {be}} and the \Delta \text V{\textrm {be}} voltage terms independently. The bandgap reference and ADC combination have an input referred noise spectral density of 4.7~\mu \text V/\surd Hz from 0.1 to 162 Hz yielding 15 stable output bits. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CAPACITOR switching
*STORAGE batteries
*BAND gaps
Subjects
Details
- Language :
- English
- ISSN :
- 15498328
- Volume :
- 64
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Circuits & Systems. Part I: Regular Papers
- Publication Type :
- Periodical
- Accession number :
- 122301718
- Full Text :
- https://doi.org/10.1109/TCSI.2016.2621725