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 language | English |
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Article number | 7811238 |
Pages (from-to) | 1034-1043 |
Number of pages | 10 |
Journal | IEEE Journal of Solid State Circuits |
Volume | 52 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2017 |
Bibliographical note
Accepted Author ManuscriptKeywords
- Current-sensing system (CSS)
- dynamic bandgap reference (BGR)
- lead frame shunt resistor
- temperature compensation
- temperature sensor