On-chip all-in-one micro integrated magnetic sensor

Abstract

The invention relates to an on-chip all-in-one micro integrated magnetic sensor, which consists of a Hall part, a dynamic imbalance eliminating circuit, a hysteresis comparison circuit, a logic control and oscillator circuit and an H-bridge output circuit, wherein the logic control and oscillator circuit provides two complementary clock signals CLK1 and CLK2 which are obtained by inverting the same clock signal; the dynamic imbalance eliminating circuit comprises an instrument amplifier and a sampling capacitor, under the clock signals CLK1 and CLK2, a voltage signal of the Hall part is inputted into the instrument amplifier, and the hysteresis comparison circuit is of a Schmidt trigger circuit. When CLK1 is adopted as the clock signal and CLK1 signal is high, the output of the hysteresiscomparison circuit is maintained; and when CLK1 signal is low, the output of the dynamic imbalance eliminating circuit is compared with the reference voltage of the hysteresis comparison circuit. Thestability of the circuit performance is good, the production cost is low, the production links and the test links are reduced, the encapsulation difficulty is reduced, and the automatic industrialized mass production can be realized.

Description

technical field [0001] The invention relates to a low-voltage and low-power on-chip integrated micro-integrated magnetic sensor circuit for a micro DC brushless motor, and is especially suitable for a vibration motor of a mobile phone. Background technique [0002] The history of the emergence and application of magnetic sensors has been more than 100 years. Magnetic sensors are devices that convert changes in the magnetic properties of sensitive components caused by magnetic fields, currents, stress and strain, temperature, and light into electrical signals, and detect corresponding physical quantities in this way. Modern electronic equipment is developing in the direction of miniaturization, multi-function, and intelligence. It is required that the sensors used can respond with high sensitivity and high speed even to changes in physical quantities in small spaces. This demand has driven the development trend of integrating sensors, signal conditioning, and power output con...

AI Technical Summary

Problems solved by technology

[0018] The problem to be solved by the present invention is: the existing micro-integrated magnetic sensor cannot eliminate its internal device imbalance, and the normal operation of the image sensor cannot meet the use requirements

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