23.2 A 40 A Shunt-Based Current Sensor with ±0.2% Gain Error from -40°C to 125°C and Self-Calibration

Low-cost metal (e.g., PCB trace) shunts can be used to make accurate current sensors (< 1 % gain error) [1-3]. However, their reported maximum operating temperature (85 circC) is not high enough for automotive applications, and at higher temperatures, shunt resistance may exhibit increased drift, especially at high current levels. This...