This reference design demonstrates a cost optimized three-phase inverter leg (low-side shunt) current sensing solution with high accuracy and faster response for sensorless 2-shunt or 3-shunt field oriented control (FOC). This reference design demonstrates inverter leg current sensing with full swing response settling time close to 1-µs and accuracy error less than 1%. The design also shows very good noise rejection even with high power IGBTs switching nearby. The design implements overcurrent protection fully in hardware with less than 1.5-µs total response time.