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...

Examples

Embodiment Construction

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0033] Such as figure 1 Shown is an on-chip Hall signal amplifier based on chopper second-order compensation, including:

[0034] The signal input module provides the Hall positive-phase input signal and negative-phase input signal to the chopper modulation module;

[0035] The chopping modulation module is connected to the two output terminals of the signal input module, and modulates and outputs the positive-phase input signal and the negative-phase input signal; the chopping modulation module is composed of two mixers;

[0036] The clock module provides switching frequency and modulation frequency for the chopping modulation module; the chopping modulation module switches the input signal between positive phase and negative phase based on the switching frequency of the clock module, and modulates the offset voltage in the input signal to ...

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...

Examples

Embodiment Construction

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0033] Such as figure 1 Shown is an on-chip Hall signal amplifier based on chopper second-order compensation, including:

[0034] The signal input module provides the Hall positive-phase input signal and negative-phase input signal to the chopper modulation module;

[0035] The chopping modulation module is connected to the two output terminals of the signal input module, and modulates and outputs the positive-phase input signal and the negative-phase input signal; the chopping modulation module is composed of two mixers;

[0036] The clock module provides switching frequency and modulation frequency for the chopping modulation module; the chopping modulation module switches the input signal between positive phase and negative phase based on the switching frequency of the clock module, and modulates the offset voltage in the input signal to ...

Images