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Fast stable ripple reduction loop for high-speed precision chopper amplifier

A technology of chopper amplifiers and amplifier circuits, which is applied in the direction of improving amplifiers to reduce noise effects, amplifiers, amplifier types, etc., and can solve problems such as limiting the stability of chopper amplifiers and slow transient stability

Pending Publication Date: 2022-07-29
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One problem associated with using a Ripple Reduction Loop (RRL) is the very slow performance of transient settling, which limits the stability performance of the overall chopper amplifier

Method used

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  • Fast stable ripple reduction loop for high-speed precision chopper amplifier
  • Fast stable ripple reduction loop for high-speed precision chopper amplifier
  • Fast stable ripple reduction loop for high-speed precision chopper amplifier

Examples

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Embodiment Construction

[0034] Various embodiments described herein achieve a reduction in the settling time of the RRL loop to improve the overall settling performance of the chopper amplifier system. Specifically, the RRL is placed in a particular state in response to amplifier nonlinear operating events, such as input multiplexer switching, such that the chopper amplifier system recovers faster and thus reduces the settling time of the system, The input multiplexer switch may present a step to the amplifier circuit's input or an excessive slew rate to the amplifier circuit that limits input transients. To ensure loop stability, the bandwidth of the RRL or similar ripple attenuation filter should be reduced relative to the chopping frequency used for the chopper circuit in the chopper amplifier system. In one example embodiment, the chopping frequency is 10 to 1000 times lower than the bandwidth of the amplifier circuit. Establish an upper limit on the chopper frequency to limit higher switch inpu...

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Abstract

A method of fast stabilization of a ripple reduction loop for a high speed precision chopping amplifier includes amplifying an input signal with a signal path to generate a first output, the signal path including chopping the input signal to generate a first chopper output, amplifying the first chopper output with an amplifier to generate an amplifier output, and outputting the amplifier output. And chopping the amplified output to generate a second chopper output. Reducing an output ripple of the first output with a ripple reduction loop (RRL), the RRL including chopping the second chopper output to generate a third chopper output, filtering the third chopper output with a filter to generate a direct current (DC) offset correction, and combining the DC offset correction with the amplifier output to reduce the output ripple of the first output. Wherein the third chopper outputs an output voltage driven to the filter, and the RRL is disconnected from a low frequency signal path in response to a non-linear event.

Description

technical field [0001] The present disclosure relates generally to amplifiers, and more particularly, to chopper amplifiers with fast settling ripple reduction. Background technique [0002] The chopper amplifier includes a signal path for amplifying high frequency signals and a second parallel path with high gain and chopper switches for low frequency signals. In various examples of chopper amplifiers, the second parallel path modulates the input signal using the first chopper, thereby converting the input signal to an alternating current (AC) signal. Next, the AC signal is amplified with an amplifier and converted back to a DC signal with a second chopper, thereby demodulating the amplified AC signal. Therefore, low offset error and drift are achieved, and 1 / f noise reduction is achieved. [0003] One disadvantage of chopper amplifiers is the presence of voltage ripple at the final output. The fundamental frequency of this voltage ripple noise occurs at the chopper freq...

Claims

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Application Information

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IPC IPC(8): H03F1/26H03F3/38
CPCH03F1/26H03F3/38H03F2200/372H03F3/387H03F3/45968H03F2200/459H03F2200/271H03F3/45475
Inventor 兰加·塞舒·帕拉杜古邢汉青顺·G·利姆
Owner NXP BV