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A 50 pA-Input-Bias-Current 134 dB-Open-Loop-Gain Operational Amplifier with a New CMFB and Base Current Compensation Circuit.

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Title: A 50 pA-Input-Bias-Current 134 dB-Open-Loop-Gain Operational Amplifier with a New CMFB and Base Current Compensation Circuit.
Authors: Hong, Ting1,2, Li, Wenchang2,3 iwc@semi.ac.cn, Liu, Jian1,4, Zhang, Tianyi2
Source: Progress in Electromagnetics Research C. 2026, Vol. 166, p169-175. 7p.
Subjects: Operational amplifiers, Electronic feedback, Electronic amplifiers, Electric currents, Bipolar integrated circuits
Abstract: In the design of a precision operational amplifier (OPA), cancellation of the input bias current is a challenging issue, which is primarily limited by the current mirror mismatch and the low β value of the PNP transistors. This article proposes a new base current compensation design, which enables zero input-bias-current theoretically. The input stage of the circuit is an active load differential pair with a new common-mode feedback (CMFB) circuit based on the current reuse technique, which can provide a stable common-mode voltage for the amplifier without additional power consumption and area occupation. The proposed OPA is designed in a bipolar process with a core area of 2.85 mm x 1.5 mm. Simulation results show that this OPA achieves a 134_dB open-loop-gain, 50 pA input-bias-current @25°C, and a low supply current of 0.9 mA, which suggests a concise architecture of the OPA for low offset, low noise, low input bias current, and high gain. [ABSTRACT FROM AUTHOR]
Copyright of Progress in Electromagnetics Research C is the property of Electromagnetics Academy 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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DbLabel: Engineering Source
An: 192370912
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  Data: <searchLink fieldCode="JN" term="%22Progress+in+Electromagnetics+Research+C%22">Progress in Electromagnetics Research C</searchLink>. 2026, Vol. 166, p169-175. 7p.
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  Data: <searchLink fieldCode="DE" term="%22Operational+amplifiers%22">Operational amplifiers</searchLink><br /><searchLink fieldCode="DE" term="%22Electronic+feedback%22">Electronic feedback</searchLink><br /><searchLink fieldCode="DE" term="%22Electronic+amplifiers%22">Electronic amplifiers</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+currents%22">Electric currents</searchLink><br /><searchLink fieldCode="DE" term="%22Bipolar+integrated+circuits%22">Bipolar integrated circuits</searchLink>
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  Label: Abstract
  Group: Ab
  Data: In the design of a precision operational amplifier (OPA), cancellation of the input bias current is a challenging issue, which is primarily limited by the current mirror mismatch and the low β value of the PNP transistors. This article proposes a new base current compensation design, which enables zero input-bias-current theoretically. The input stage of the circuit is an active load differential pair with a new common-mode feedback (CMFB) circuit based on the current reuse technique, which can provide a stable common-mode voltage for the amplifier without additional power consumption and area occupation. The proposed OPA is designed in a bipolar process with a core area of 2.85 mm x 1.5 mm. Simulation results show that this OPA achieves a 134_dB open-loop-gain, 50 pA input-bias-current @25°C, and a low supply current of 0.9 mA, which suggests a concise architecture of the OPA for low offset, low noise, low input bias current, and high gain. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Progress in Electromagnetics Research C is the property of Electromagnetics Academy 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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      – Type: doi
        Value: 10.2528/PIERC25120703
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 7
        StartPage: 169
    Subjects:
      – SubjectFull: Operational amplifiers
        Type: general
      – SubjectFull: Electronic feedback
        Type: general
      – SubjectFull: Electronic amplifiers
        Type: general
      – SubjectFull: Electric currents
        Type: general
      – SubjectFull: Bipolar integrated circuits
        Type: general
    Titles:
      – TitleFull: A 50 pA-Input-Bias-Current 134 dB-Open-Loop-Gain Operational Amplifier with a New CMFB and Base Current Compensation Circuit.
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            NameFull: Hong, Ting
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            NameFull: Li, Wenchang
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            NameFull: Liu, Jian
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            NameFull: Zhang, Tianyi
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          Dates:
            – D: 01
              M: 04
              Text: 2026
              Type: published
              Y: 2026
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              Value: 166
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            – TitleFull: Progress in Electromagnetics Research C
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