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WBG Integration and Reliability

D04.8 - Digitization of a Hybrid Current Sensor for Enhanced Measurement Accuracy and Noise Reduction in Power Electronics Applications

Thursday, March 26, 2026
12:00 PM - 1:45 PM CT
Location: Hemisfair Ballroom
Hybrid current sensors combine low-frequency detectors (magnetoresistance) with high-frequency detectors (Rogowski coil) to achieve DC and AC measurement with wide bandwidth. In high-frequency switching environments, their analog outputs are prone to EMI from fast dv/dt transients, causing spectral distortion and reduced accuracy. This work digitizes the single-ended analog output of a hybrid current sensor using a 12-bit ADC (LTC2253) to suppress noise and enhance signal fidelity. Tests on a 100 kHz DC–DC converter show SNR improvement from 11.6 dB to 18.3 dB, equivalent to a 53% noise amplitude reduction. FFT results confirm a lower noise floor and clearer frequency separation. The approach enables real-time filtering, frequency-domain analysis, and direct integration with microcontrollers, DSPs, or FPGA platforms, paving the way for compact PCB-level sensor, ADC integration.