A +/- 36-A Integrated Current-Sensing System With a 0.3% Gain Error and a 400-mu A Offset From-55 degrees C to+85 degrees C

作者：Shalmany Saleh Heidary^*; Draxelmayr Dieter; Makinwa Kofi A A

来源：IEEE Journal of Solid-State Circuits, 2017, 52(4): 1034-1043.

DOI：10.1109/JSSC.2016.2639535

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

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-mu A offset, which is significantly better than the stateof-the-art systems. The heart of the system is a robust 260-mu Omega shunt resistor made from the lead frame of a standard HVQFN plastic package. The resulting voltage drop is then digitized by a precision Delta Sigma ADC and a bandgap reference (BGR). At the expense of current handling capability, a +/- 5-A version of the CSS uses a 10-m Omega on-chip metal shunt to achieve just a 4-mu A offset. Both designs are realized in a standard 0.13-mu m CMOS process and draw 13 mu A from a 1.5-V supply. Compensation of the spread and nonlinear temperature dependency of the shunt resistor R-shunt 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.

• 出版日期2017-4