A Hybrid Multi-Path CMOS Magnetic Sensor With 76 ppm/°C Sensitivity Drift and Discrete-Time Ripple Reduction Loops
| Autor: | Kofi A. A. Makinwa, Junfeng Jiang |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
sensitivity stabilization
Materials science Ripple ripple reduction loops 02 engineering and technology magnetic sensor 01 natural sciences 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering Spinning Discrete-time business.industry 020208 electrical & electronic engineering 010401 analytical chemistry Bandwidth (signal processing) wide bandwidth Electrical engineering Atmospheric temperature range 0104 chemical sciences Magnetic field CMOS Optoelectronics Hall sensor Hall effect sensor pick-up coils business Temperature coefficient low drift |
| Zdroj: | IEEE Journal of Solid State Circuits, 52(7) |
| ISSN: | 1558-173X 0018-9200 |
| Popis: | This paper presents a temperature-insensitive magnetic sensor system for contactless current measurements. To simultaneously achieve wide bandwidth and low noise, the proposed system employs a multi-path structure with a set of spinning current Hall sensors in its low-frequency path and a set of pick-up coils in its high-frequency path. The Hall sensors and pick-up coils are used in a differential sensing arrangement that naturally rejects common-mode magnetic field interference, e.g., due to the earth's magnetic field. A common-mode ac reference field can then be used to continuously stabilize the sensitivity of the Hall sensors, which, unlike that of the pick-up coils, is quite temperature dependent. In this design, the ripple reduction loops in the Hall sensor readout are implemented in a discrete-time manner, and so occupy 20% less area than a previous continuous-time implementation. Over a-45 °C to 105 °C temperature range, the proposed system reduces the Hall sensor drift from 22% to 1%, which corresponds to a temperature coefficient of 76 ppm/°C. |
| Databáze: | OpenAIRE |
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