Abstract
With the continuous intelligentization of power systems, the demand for the integration of digital chips and sensor chips such as the Internet of Things is also increasing. A CMOS lineal magnetic Hall sensor front‐end working in current mode with programmable gain stage is designed and implemented with SMIC 55 nm standard CMOS technology. By using a spinning‐current technique, chopper technique, and digital calibration technique to eliminate the offset voltage and nonlinearity, this magnetic Hall sensor can be easily integrated into digital systems like SoCs. This work has already finished the circuit simulation and layout design, and all simulation indicators basically reach the expected value. The maximum gain of proposed sensor systems can be up to 33.9 dB. The total power is less than 4 mW. And the total area is less than 0.113 μm2. The magnetic Hall sensor can be easily integrated into chips such as the power Internet of Things to form a single‐chip‐level SoC design, which is mainly used in applications such as circuit breakers and electric energy measurement.
Highlights
With the rapid development of very large-scale integrated circuits, various new types of equipment and various digital chips used in power grids and related digital-analog hybrid sensor chips are emerging
As a part of the special chip for the power Internet of Things, it can measure the current inside the line without contact by measuring the magnetic induction near the power line, which can be applied to various occasions such as circuit breakers and energy measurement
The simulation results show that the proposed Hall sensor system can amplify a 168 μv (Vpp) Hall voltage to 414 mv
Summary
With the rapid development of very large-scale integrated circuits, various new types of equipment and various digital chips used in power grids and related digital-analog hybrid sensor chips are emerging. Used special control chips for power Internet of Things generally have an integration level only to the digital-analog/analog-to-digital converter level, and the corresponding sensor part still needs to be connected to an off-chip chip. On the premise of meeting standard CMOS silicon process manufacturing, many of the off-chip sensor circuit parts have already been integrated into the SoC to form a singlechip-level design. Hall sensor is one of which is easy to integrate with standard CMOS process. As a part of the special chip for the power Internet of Things, it can measure the current inside the line without contact by measuring the magnetic induction near the power line, which can be applied to various occasions such as circuit breakers and energy measurement
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