A ±36-A Integrated Current-Sensing System with a 0.3% Gain Error and a 400-μA Offset From-55 °c to +85 °c

Saleh Heidary Shalmany, Dieter Draxelmayr, Kofi A.A. Makinwa

Research output: Contribution to journalArticleScientificpeer-review

18 Citations (Scopus)
30 Downloads (Pure)

Abstract

This paper presents an integrated shunt-based current-sensing system (CSS) capable of handling ±36-A currents, the highest ever reported. It also achieves a 0.3% gain error and a 400-μA offset, which is significantly better than the state-of-the-art systems. The heart of the system is a robust 260-μ Ω shunt resistor made from the lead frame of a standard HVQFN plastic package. The resulting voltage drop is then digitized by a precision Δ Σ ADC and a bandgap reference (BGR). At the expense of current handling capability, a ±5-A version of the CSS uses a 10-mΩ on-chip metal shunt to achieve just a 4-μ A offset. Both designs are realized in a standard 0.13-μm CMOS process and draw 13 μA from a 1.5-V supply. Compensation of the spread and nonlinear temperature dependency of the shunt resistor Rshunt is accomplished by the use of a fixed polynomial master curve and a single room temperature calibration. This procedure also effectively compensates for the residual spread and nonlinearity of the ADC and the BGR.

Original languageEnglish
Article number7811238
Pages (from-to)1034-1043
Number of pages10
JournalIEEE Journal of Solid State Circuits
Volume52
Issue number4
DOIs
Publication statusPublished - 2017

Bibliographical note

Accepted Author Manuscript

Keywords

  • Current-sensing system (CSS)
  • dynamic bandgap reference (BGR)
  • lead frame shunt resistor
  • temperature compensation
  • temperature sensor

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