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<p>This paper presents a high-voltage operational amplifier featuring a multipath chopper architecture with auto-correction feedback (ACFB) that achieves 4.7&#xa0;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&#xa0;μV (peak-to-peak) and 4.31&#xa0;μV (average) equivalent input offset, along with enhanced dynamic performance through a slew rate boost circuit achieving 39.8&#xa0;V/μs (rising) and 20.4&#xa0;V/μs (falling) slew rates. The amplifier delivers 9.2&#xa0;MHz bandwidth while consuming only 1.8&#xa0;mA quiescent current across flexible power supply configurations (0&#xa0;V/36&#xa0;V or ± 18&#xa0;V), making it particularly suitable for precision high-voltage analog applications.</p>

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

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Peipei Li,
  • Li Luo

摘要

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.