Hall element analog front-end circuit

Abstract

The invention discloses a Hall element analog front-end circuit, and the circuit comprises a Hall element, a Hall element excitation source, a voltage input part, a voltage stabilizing circuit, an RFchoke circuit, a first DC blocking capacitor, a second DC blocking capacitor, a first input resistor, a second input resistor, a first feedback resistor, a second feedback resistor, a first chopper switch, a second chopper switch, a timing sequence control circuit, a transconductance operational amplifier, a Sigma_Delta modulator. The circuit finally outputs a PWM code. The Hall element which is resistant to high temperature and high in sensitivity and linearity is combined with the SOI circuit and device which are resistant to high temperature, high in speed and low in power consumption, so the circuit is resistant to high temperature, is high in sensitivity, and is high in linearity. A DC component in an output signal is effectively removed through the introduction of the blocking capacitor, and an AC component in the voltage input is effectively removed through the introduction of the RF choke circuit. The voltage stabilizing circuit can enable an input voltage of the transconductance operational amplifier to be more stable. The impact from the scintillation noise and offset voltage is effectively reduced through the introduction of the chopper switches.

Description

technical field [0001] The invention relates to the technical field of semiconductor magnetic sensors, in particular to a Hall element analog front-end circuit. Background technique [0002] Sensor technology, communication technology and computer technology together constitute the three pillar technologies of modern information technology, which are widely used in various fields of national economy. The Hall sensor is a magnetic sensor based on the Hall effect. It is the most important among all kinds of magnetic sensors. It is an indispensable and important component in the manufacturing process of national defense, industry, civil and other departments. Measuring electromagnetic parameters is also widely used to measure non-electrical parameters such as linear displacement, rotational speed, pressure and angular displacement. [0003] GaAs Hall sensors have the advantages of high temperature resistance, high linearity, and high sensitivity. Traditional GaAs Hall element ...

AI Technical Summary

Problems solved by technology

[0003] GaAs Hall sensors have the advantages of high temperature resistance, high linearity, and high sensitivity. Traditional GaAs Hall element analog front-end circuits usually use bulk silicon materials to prepare circuits and components, which severely limits the performance of GaAs Hall sensors. For the application of sensors in the high-temperature field, how to make full use of the advantages of GaAs Hall sensors to solve the detection requirements under high-temperature conditions is an urgent problem to be solved and has broad application prospects

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