Improving Performance of Current Sensor Chip Based on Multi-Parameter Compensation : Compensation & Decimation Filter for Digital Chip

This paper presents a current sensor chip that can compensate PVTs and provide highly accurate current measurement. The proposed current sensor chip consists of analog part and a digital part. The analog part amplifies the input signal and converts it to digital signals. It provides clock and two sigma-delta modulator results to digital part. The digital part down samples the modulator results through the decimation filter, while correcting the current errors via the proposed compensation block. To obtain efficient compensation, a 2D linear interpolation is carried out using two lookup tables. The compensation block can cover a current range from 0 to 1500 A and a temperature range from -40 to $270^{\circ}\mathrm{C}$. In addition, the digital decimation filter output of Sigma-Delta ADC can reduce the noise in ADC output by using 128 averaging operation, unlike conventional methods.