A Wideband and Low-Noise CMOS-Integrated X-Hall Current Sensor Operating in Current Mode

Power electronic circuits are moving toward higher switching frequencies, exploiting the capabilities of novel devices, so as to shrink dimension passive components. This trend demands sensors able operate at such high frequencies. article aims demonstrate broadband capability a fully integrated CMOS current sensor based on X-Hall approach and configured in mode, by alleviating impact stray capacitive loading probe–readout interface. Current-mode operation enables usage transimpedance amplifier (TIA) readout circuit, offering better bandwidth, noise, power performance than conventional instrumentation amplifiers (IAs). The system exploits common-mode (CM) control submodules different supply voltages, respectively, 5 V for probe achieve sensitivity, 1.2 exploit transition frequency transistors with reduced oxide thickness. A chip-on-board mounting limits parasitic inductive effects host printed circuit board (PCB). developed prototype achieves maximum acquisition bandwidth 12 MHz. With consumption 11.46 mW resolution 39 mA rms , it presents sensitivity 8% $T^{-1}$ an FoM 569 MHz/ notation="LaTeX">$\text{A}^{2}$ mW, which is significantly state-of-the-art hybrid Hall/coil solutions. implemented 90-nm microelectronic process from STMicroelectronics occupies silicon area 2.4 mm 2 .