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A 4.7 nV/√Hz Multipath Chopper High-Voltage Operational Amplifier with Auto-correction Feedback.

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Title: A 4.7 nV/√Hz Multipath Chopper High-Voltage Operational Amplifier with Auto-correction Feedback.
Authors: Li, Peipei1 (AUTHOR), Luo, Li1 (AUTHOR) lluo@bjtu.edu.cn
Source: Circuits, Systems & Signal Processing. Mar2026, Vol. 45 Issue 3, p1567-1586. 20p.
Subjects: Operational amplifiers, Noise, Signal processing
Abstract: This paper presents a high-voltage operational amplifier featuring a multipath chopper architecture with auto-correction feedback (ACFB) that achieves 4.7 nV/√Hz input-referred noise. Through theoretical analysis, how the high-frequency path modifies the system's pole-zero distribution is demonstrated, confirming the bandwidth superiority of the multipath topology over conventional single-path implementations. The proposed ACFB technique combines a chopper modulator, two first-order passive RC filters, an integrator, and a switched-capacitor notch filter to effectively suppress both ripple-induced offset in the transconductance stage (Gm1) and low-frequency noise components. Post-layout simulations verify outstanding performance metrics: 9.84 μV (peak-to-peak) and 4.31 μV (average) equivalent input offset, along with enhanced dynamic performance through a slew rate boost circuit achieving 39.8 V/μs (rising) and 20.4 V/μs (falling) slew rates. The amplifier delivers 9.2 MHz bandwidth while consuming only 1.8 mA quiescent current across flexible power supply configurations (0 V/36 V or ± 18 V), making it particularly suitable for precision high-voltage analog applications. [ABSTRACT FROM AUTHOR]
Copyright of Circuits, Systems & Signal Processing is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: A 4.7 nV/√Hz Multipath Chopper High-Voltage Operational Amplifier with Auto-correction Feedback.
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  Data: <searchLink fieldCode="AR" term="%22Li%2C+Peipei%22">Li, Peipei</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Luo%2C+Li%22">Luo, Li</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> lluo@bjtu.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Circuits%2C+Systems+%26+Signal+Processing%22">Circuits, Systems & Signal Processing</searchLink>. Mar2026, Vol. 45 Issue 3, p1567-1586. 20p.
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  Data: <searchLink fieldCode="DE" term="%22Operational+amplifiers%22">Operational amplifiers</searchLink><br /><searchLink fieldCode="DE" term="%22Noise%22">Noise</searchLink><br /><searchLink fieldCode="DE" term="%22Signal+processing%22">Signal processing</searchLink>
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  Data: This paper presents a high-voltage operational amplifier featuring a multipath chopper architecture with auto-correction feedback (ACFB) that achieves 4.7 nV/√Hz input-referred noise. Through theoretical analysis, how the high-frequency path modifies the system's pole-zero distribution is demonstrated, confirming the bandwidth superiority of the multipath topology over conventional single-path implementations. The proposed ACFB technique combines a chopper modulator, two first-order passive RC filters, an integrator, and a switched-capacitor notch filter to effectively suppress both ripple-induced offset in the transconductance stage (Gm1) and low-frequency noise components. Post-layout simulations verify outstanding performance metrics: 9.84 μV (peak-to-peak) and 4.31 μV (average) equivalent input offset, along with enhanced dynamic performance through a slew rate boost circuit achieving 39.8 V/μs (rising) and 20.4 V/μs (falling) slew rates. The amplifier delivers 9.2 MHz bandwidth while consuming only 1.8 mA quiescent current across flexible power supply configurations (0 V/36 V or ± 18 V), making it particularly suitable for precision high-voltage analog applications. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Circuits, Systems & Signal Processing is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Text: English
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      – SubjectFull: Operational amplifiers
        Type: general
      – SubjectFull: Noise
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      – SubjectFull: Signal processing
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      – TitleFull: A 4.7 nV/√Hz Multipath Chopper High-Voltage Operational Amplifier with Auto-correction Feedback.
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              Text: Mar2026
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