Dynamic ripple elimination circuit for linear Hall signal amplifier

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By introducing a dynamic ripple removal circuit of ripple extraction network, fully differential integrator and vanishing buffer into the linear Hall signal amplifier, the problem of ripple removal impact on bandwidth in traditional Hall amplifiers is solved, and efficient ripple removal effect is achieved.

CN120474499APending Publication Date: 2025-08-12WUXI ETEK MICROELECTRONICS

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Patent Information

Application Number: CN202510471181.4
Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner
Filing Date: 2025-04-15
Publication Date: 2025-08-12

Application Information

Patent Timeline

15 Apr 2025

Application

CN202510471181.4

12 Aug 2025

Publication

CN120474499A

IPC: H03F1/32; H03F1/08; H03F15/00

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Application Domain

Amplifier modifications to reduce non-linear distortionGalvano-magnetic amplifiers

Technology Topics

IntegratorRipple cancellation

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AI Technical Summary

Technical Problem

Traditional linear Hall amplifiers require a post-stage low-pass filter to eliminate ripple, resulting in reduced system bandwidth and affecting signal fidelity and noise suppression.

Method used

A dynamic ripple cancellation circuit is designed, including a ripple extraction network, a fully differential integrator, a chopper and a vanishing buffer. By extracting the ripple signal output from the amplifier and feeding it back to the input, the ripple signal is eliminated without affecting the system bandwidth.

Benefits of technology

It realizes effective removal of ripple without reducing the system bandwidth, avoiding the adverse impact of low-pass filters on bandwidth, and the circuit structure is simple and has a wide range of applications.

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Abstract

The invention relates to a dynamic ripple elimination circuit for a linear Hall signal amplifier, and belongs to the technical field of circuits. The dynamic ripple elimination circuit for the linear Hall signal amplifier comprises a ripple extraction network, a fully differential integrator, a chopper and a disappearance tone buffer which are connected in sequence, and the ripple extraction network extracts ripple signals in output signals of the amplifier; and through integration, chopping and buffering, a compensation signal for eliminating ripples is generated and injected into a main loop of the amplifier, and the ripples in an output signal of the linear Hall signal amplifier are eliminated. Therefore, a low-pass filter does not need to be adopted at the rear stage, adverse effects on the bandwidth are avoided, and the circuit is simple in structure and quite wide in application range.

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