Flicker Noise Analysis on Chopper Amplifier

Zhou, Ting; Gao, Zhuo; Huang, Jiajie; Lu, Yewangqing; Chen, Mingyi; Li, Yongfu

doi:10.1109/newcas50681.2021.9462742

Cited by 4 publications

(2 citation statements)

References 22 publications

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“…One of its major drawbacks is the introduction of additional electronic noise, which can easily become detrimental to low-noise biosensor applications as demonstrated in [4], [17], [18], and [19]. While significant effort has been devoted to the noise analysis and optimization of chopper amplifiers [4], [16], [20], [21], a comprehensive analysis of the noise contribution of the DSL has not been widely investigated. A poorly designed DSL can become the primary source of noise in the amplifier chain, thereby reducing the signal-to-noise ratio (SNR) and compromising the amplifier's performance.…”

Section: Introductionmentioning

confidence: 99%

Noise Analysis and Design Methodology of Chopper Amplifiers With Analog DC-Servo Loop for Biopotential Acquisition Applications

Huang,

Rodriguez

2024

IEEE Trans. VLSI Syst.

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Biopotential acquisition chopper instrumentation amplifiers require a dc-servo loop (DSL) in order to filter electrode dc offsets. However, the noise performance degradation due to the addition of the DSL is often overlooked despite that it can be very detrimental at the frequencies of interest. This article presents an in-depth noise analysis of biopotential acquisition chopper instrumentation amplifiers with analog DSLs. Analytical expressions that predict the noise of different DSL implementations are found and a design flow to minimize their noise contribution is proposed. The design methodology is demonstrated with example circuits targeting biopotential recording systems. These circuits are implemented using a standard 180 nm CMOS technology, and their performance is verified through postlayout simulations. The findings of this work provide a comprehensive understanding of the noise characteristics of a DSL, its impact on noise performance, and design strategies for noise optimization.

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Section: Introductionmentioning

confidence: 99%

Noise Analysis and Design Methodology of Chopper Amplifiers With Analog DC-Servo Loop for Biopotential Acquisition Applications

Huang,

Rodriguez

2024

IEEE Trans. VLSI Syst.

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“…Despite the benefits gained from the DSL, one of the major drawbacks is the additional electronic noise that is introduced, which can easily dominate and become very detrimental in low-noise biosensor applications. Many efforts have been put into noise analysis and optimization of chopper amplifiers [6]- [8]. Unfortunately, a comprehensive analysis of the noise contribution of the DSL has not gained much attention.…”

Section: Introductionmentioning

confidence: 99%

Noise Analysis of Current-Feedback DC-Servo Loop in Current-Balancing Chopper Amplifiers

Huang

Rodriguez

2022

2022 IEEE Nordic Circuits and Systems Conference (NorCAS)

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Chopper amplifiers for biopotential acquisition commonly suppress differential electrode DC offsets by using a DCservo loop (DSL). However, the noise contribution of the DSL is always neglected in noise analysis. The noise introduced by the DSL, in particular at low frequencies, is of great importance in biosensor applications. This work presents the noise modeling of a current-balancing chopper amplifier with DSL and describes the effect of the DSL on the noise performance. Two different DSL implementations are analyzed. It is found that the exact placement of the chopper in the DSL has a strong impact in the noise performance; therefore, its placement can not be arbitrarily selected. A circuit topology to minimize its noise contribution is then proposed and verified by simulation.

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V2Va +: An Efficient SystemVerilog & Verilog-to-Verilog-A Translator for Accelerated Mixed-Signal Simulation

Wang,

Shao,

Huang

et al. 2024

IEEE Open J. Circuits Syst.

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Flicker Noise Analysis on Chopper Amplifier

Cited by 4 publications

References 22 publications

Noise Analysis and Design Methodology of Chopper Amplifiers With Analog DC-Servo Loop for Biopotential Acquisition Applications

Noise Analysis and Design Methodology of Chopper Amplifiers With Analog DC-Servo Loop for Biopotential Acquisition Applications

Noise Analysis of Current-Feedback DC-Servo Loop in Current-Balancing Chopper Amplifiers

V2Va +: An Efficient SystemVerilog & Verilog-to-Verilog-A Translator for Accelerated Mixed-Signal Simulation

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