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Four Current Path PRFC OTA with Cross-Coupled Positive Feedback with Improved Gain and PSRR for Analog Signal Processing.

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Title: Four Current Path PRFC OTA with Cross-Coupled Positive Feedback with Improved Gain and PSRR for Analog Signal Processing.
Authors: Singh, Rahul1 (AUTHOR) ak43103333@gmail.com, Wairya, Subodh1 (AUTHOR) swairya@gmail.com
Source: Journal of Circuits, Systems & Computers. 8/30/2026, Vol. 35 Issue 14, p1-41. 41p.
Subjects: Operational amplifiers, Analog circuits, Complementary metal oxide semiconductors, Frequency response
Abstract: In traditional folded cascode (FC) and double-recycling folded cascode (DRFC) operational transconductance amplifier (OTA) designs, high-performance analog circuits frequently encounter constraints in power supply rejection ratio (PSRR), transconductance and bandwidth. The proposed OTA is designed with a two-stage FC architecture integrated with four current paths and enhanced by cross-coupled positive feedback (PRFC). It is architecturally realized as a two-stage folded cascode OTA to facilitate gain boosting, improved bandwidth and enhanced PSRR. This two-stage nature fundamentally influences stability, transient response and frequency compensation analysis. By increasing effective transconductance, these methods guarantee that even inactive devices in the signal path enhance performance without consuming more power. Simulations in 90 nm CMOS technology show significant advancements compared to DRFC. The suggested design improves slew rate, PSRR and phase margin while achieving a 29-dB higher unity-gain frequency (UGF) and a 14-dB higher DC gain when compared to a traditional DRFC amplifier and phase margin at nearly the same power consumption. This work highlights a transconductance-enhanced OTA architecture that provides a strong balance of power efficiency and performance, making it suitable for next-generation high-performance analog design. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Circuits, Systems & Computers is the property of World Scientific Publishing Company 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.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 194008190
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Four Current Path PRFC OTA with Cross-Coupled Positive Feedback with Improved Gain and PSRR for Analog Signal Processing.
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  Data: <searchLink fieldCode="AR" term="%22Singh%2C+Rahul%22">Singh, Rahul</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> ak43103333@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Wairya%2C+Subodh%22">Wairya, Subodh</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> swairya@gmail.com</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Circuits%2C+Systems+%26+Computers%22">Journal of Circuits, Systems & Computers</searchLink>. 8/30/2026, Vol. 35 Issue 14, p1-41. 41p.
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  Data: <searchLink fieldCode="DE" term="%22Operational+amplifiers%22">Operational amplifiers</searchLink><br /><searchLink fieldCode="DE" term="%22Analog+circuits%22">Analog circuits</searchLink><br /><searchLink fieldCode="DE" term="%22Complementary+metal+oxide+semiconductors%22">Complementary metal oxide semiconductors</searchLink><br /><searchLink fieldCode="DE" term="%22Frequency+response%22">Frequency response</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: In traditional folded cascode (FC) and double-recycling folded cascode (DRFC) operational transconductance amplifier (OTA) designs, high-performance analog circuits frequently encounter constraints in power supply rejection ratio (PSRR), transconductance and bandwidth. The proposed OTA is designed with a two-stage FC architecture integrated with four current paths and enhanced by cross-coupled positive feedback (PRFC). It is architecturally realized as a two-stage folded cascode OTA to facilitate gain boosting, improved bandwidth and enhanced PSRR. This two-stage nature fundamentally influences stability, transient response and frequency compensation analysis. By increasing effective transconductance, these methods guarantee that even inactive devices in the signal path enhance performance without consuming more power. Simulations in 90 nm CMOS technology show significant advancements compared to DRFC. The suggested design improves slew rate, PSRR and phase margin while achieving a 29-dB higher unity-gain frequency (UGF) and a 14-dB higher DC gain when compared to a traditional DRFC amplifier and phase margin at nearly the same power consumption. This work highlights a transconductance-enhanced OTA architecture that provides a strong balance of power efficiency and performance, making it suitable for next-generation high-performance analog design. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Circuits, Systems & Computers is the property of World Scientific Publishing Company 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: 10.1142/S0218126626500994
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      – Code: eng
        Text: English
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        PageCount: 41
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    Subjects:
      – SubjectFull: Operational amplifiers
        Type: general
      – SubjectFull: Analog circuits
        Type: general
      – SubjectFull: Complementary metal oxide semiconductors
        Type: general
      – SubjectFull: Frequency response
        Type: general
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      – TitleFull: Four Current Path PRFC OTA with Cross-Coupled Positive Feedback with Improved Gain and PSRR for Analog Signal Processing.
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            NameFull: Singh, Rahul
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            – D: 30
              M: 08
              Text: 8/30/2026
              Type: published
              Y: 2026
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