A ±5A Integrated Current-Sensing System With ±0.3% Gain Error and 16 μA Offset From −55°C to +85°C

Journal article (2016)

Authors

S. Heidary Shalmany Electronic Instrumentation - EEMCS
D. Draxelmayr Infineon Technologies
K.A.A. Makinwa Electronic Instrumentation - EEMCS
Research Group
Electronic Instrumentation (EEMCS) (TU Delft)
Copyright: © 2016 S. Heidary Shalmany, Dieter Draxelmayr, K.A.A. Makinwa
DOI: https://doi.org/10.1109/JSSC.2015.2511168
Temperature sensor Temperature compensation Coulomb counter Current-sensing system (CSS) Dynamic bandgap reference (BGR) Metal shunt resistor
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Published Date

2016

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Instrumentation

Abstract

This paper presents an integrated current-sensing system (CSS) that is intended for the use in battery-powered devices. It consists of a 10 mΩ on-chip metal shunt resistor, a switched-capacitor (SC) ΔΣ ADC, and a dynamic bandgap reference (BGR) that provides the ADC's reference voltage and also senses the shunt's temperature. The CSS is realized in a standard 0.13 μm CMOS process, occupies 1.15 mm2 and draws 55 μA from a 1.5 V supply. Extensive measurements were made on 24 devices, 12 of which were directly bonded to a printed-circuit board (PCB) and 12 of which were packaged in a standard HVQFN plastic package. For currents ranging from -5 to +5 A and over a temperature range of -55 °C to + 85 °C, they exhibit a maximum offset of 16μA and a maximum gain error of ±0.3%. This level of accuracy represents a significant improvement on the state of the art, and was achieved by the use of an accurate shunt temperature compensation scheme, a low-leakage sampling scheme, and several dynamic error correction techniques.