On-chip Hall Signal Amplifier and Method Based on Chopper Second-Order Compensation

Abstract

An on-chip Hall signal amplifier based on chopper second-order compensation, comprising: a signal input module for providing a Hall non-inverting input signal and an inverting input signal; a chopper connected to two output terminals of the signal input module A wave modulation module, configured to modulate and output the positive-phase input signal and the reverse-phase input signal; a clock module, used to provide switching frequency and modulation frequency for the chopping modulation module; and the chopping modulation module The op-amp module connected to the two output terminals is used to amplify the output signal of the chopper modulation module; it also includes a second-order compensation module connected to the output terminal of the op-amp module and a clock module, which is used to adjust the op-amp The output signal of the module is compensated and fed back to the inverting input terminal of the operational amplifier module. Compared with the prior art, the invention can effectively eliminate the offset in the whole temperature range, and improve the linearity of the output signal through the second-order compensation.

Description

technical field [0001] The invention relates to the field of signal amplification, in particular to an on-chip Hall signal amplifier based on chopper second-order compensation and methods for eliminating offset and linear compensation. Background technique [0002] In the design of integrated circuits, there are often problems such as operational amplifier misalignment, excessive voltage, excessive temperature drift of devices, and poor linearity characteristics during small signal amplification. [0003] In order to solve the above problems, technicians often need to do zero drift, temperature drift elimination, and linearity compensation for the signal conditioning amplifier circuit. The problem is that the characteristics of the tubes at the forward and reverse ends of the operational amplifier are inconsistent, and the voltage is out of balance during static operation. If the silicon-based Hall signal is directly amplified, the weak signal is easily overwhelmed by the of...

AI Technical Summary

Problems solved by technology

[0002] In the design of integrated circuits, there are often problems such as operational amplifier misalignment, excessive voltage, excessive device temperature drift, and poor linearity characteristics during small signal amplification.

[0003] In order to solve the above problems, technicians often need to do zero drift, temperature drift elimination, and linearity compensation for the signal conditioning amplifier circuit. The problem is that the characteristics of the tubes at the forward and reverse ends of the operational amplifier are inconsistent, and the voltage is out of balance during static operation. If the silicon-based Hall signal is directly amplified, the weak signal is easily overwhelmed by the offset voltage, resulting in signal Extraction is difficult; although adding offset compensation can eliminate the influence of offset voltage in a specific temperature environment and achieve the purpose of zero adjustment, when the temperature changes, the fixed compensation cannot adapt to the temperature change characteristics of the tube, which will also cause the offset compensation to lose its original function. effect

[0004] In addition, due to the silicon-based Hall's sensitivity to the magnetic field will change greatly under different voltages and temperatures, showing nonlinearity, which also makes the linear compensation effect not good.

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