Chip Structure of Programmable Linear Hall Sensor with On-chip Temperature Compensation

Abstract

The invention relates to a programmable linear Hall sensor chip structure realizing on-chip temperature compensation function, including a signal acquisition module for generating a differential output current signal, converting it into a differential voltage signal, amplifying and recovering it; a filtering processing module, and The signal acquisition module is connected to perform first-order filtering and to filter out signals at specific frequency points, so as to provide the driving capability of the Hall voltage output; the signal processing module is connected to the signal acquisition module and the filter processing module , used for temperature detection and digital signal processing, providing clocks of different timings for each module. The chip structure is used to provide a more convenient and efficient gain adjustment solution, so that the programmable linear Hall can meet client applications with different sensitivity requirements, and at the same time speed up the response time of the linear Hall, which is more suitable for some fast response application occasions. The temperature sensor and digital compensation algorithm ensure the accuracy of sensor application detection.

Description

Technical field[0001]The present invention relates to the field of sensors, and more particularly to a rapid response to the field of current sensors, specifically, a programmable linear Hall sensor chip structure that implements upper temperature compensation function.Background technique[0002]Linear Hall sensors are typically composed of Hall elements, Hall signal amplification and demodulation circuits, drive circuits. Its input is the magnetic field strength, and the output is a voltage. The output voltage is proportional to the intensity of the input magnetic field. Therefore, it is called a linear Hall sensor, which requires high sensitivity, good linearity, low temperature drift, high degree of reliability, high integration, small chip area.[0003]Depending on the characteristics of the linear Hall sensor, it can be applied to the detection of various magnetic fields. In some applications, such as position sensors, proximity sensors, power sensors, current sensors, etc. are wi...

AI Technical Summary

Problems solved by technology

The traditional programmable linear Hall has problems such as low programming accuracy and high programming complexity

For example, by adjusting the implementation of gm, gm itself is a parameter that changes with temperature, which will make the temperature compensation more complicated, and it is necessary to use multiple segment compensation to achieve the required accuracy

The pure analog compensation method or the method of using D / A increases the hardware complexity

The common filtering method will also produce a very large time delay, which will slow down the response time of the programmable linear Hall

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