Test Method for Switching Hall Sensor Noise

Abstract

The invention discloses a method for testing the noise of a switching-type Hall sensor. The method indirectly tests the noise performance of the sensor by observing the power-up process of the sensor and comprises steps of: placing the switching-type Hall sensor in a magnetic field generator; powering the sensor with a square signal output by a signal generator, wherein the amplitude of the square signal is from 0 to VDD, the VDD is the operating voltage of the sensor chip, the cycle of the square signal is 2*(Tpu + N*Ts), Tpu is the power-up time of the sensor chip, Ts is the sampling cycle of the sensor chip, N is an integer between 5 and 10, the duty cycle of the square signal is 50%; detecting the output of the sensor with a oscilloscope, wherein the oscilloscope is configured to be triggered by rising edges, a trigger source is a square wave generated by a signal generator, and persistence time is set as infinity. The method obtains a high-frequency power supply voltage source by using the signal generator on the premise of the known power-up initial state of the chip, and obtains the upper and lower limits of the BOP / BRP by observing the statistical characteristic of the power-up process of the sensor so as to obtain the noise characteristics of the switching-type Hall sensor.

Description

technical field [0001] The invention belongs to the technical field of sensor testing, and relates to a sensor noise testing method, in particular to a switching type Hall sensor noise testing method. Background technique [0002] The Hall sensor is a magnetic field sensor made according to the Hall effect. It has a wide range of applications in the automotive industry, including power, body control, traction control, and anti-lock braking systems. In order to meet the needs of different systems, Hall sensors are divided into two types: linear Hall sensors and switch Hall sensors. Noise performance, as an important indicator of Hall sensors, plays a vital role in the design of Hall sensors, especially high-sampling rate and high-precision switching Hall sensors. The specific manifestation of noise in a switching Hall sensor is that it causes random changes in the switching threshold of the sensor. [0003] figure 1 Shown is the input and output characteristics of an ideal...

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Problems solved by technology

[0005] Unfortunately, most current magnetic field generators cannot generate high-frequency alternating magnetic fields, so it is extremely difficult to test the noise performance of the switch-type Hall sensor BOP / BRP

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