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Improved transconductance multipath recycling folded cascode amplifier

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Abstract

In this paper, an enhanced multipath recycling folded cascode (EMRFC) operational transconductance amplifier (OTA) is presented. In the proposed amplifier a high current node is created in the recycling structure by shorting the two drains of the current mirrors and a positive feedback at the output load are employed with multipath current recycling technique. With these modifications, the proposed amplifier achieves a high DC gain and unity gain bandwidth. The proposed EMRFC amplifier with conventional FC, RFC, and IRFC amplifiers are designed and implemented using UMC 180 nm CMOS technology for a total bias current of 300 \(\mu\)A. The EMRFC amplifier exhibits a DC gain enhancement of about 40 dB as well as a 90 MHz increase in UGB compared to the conventional folded cascode configuration. Moreover, the input-referred noise of the proposed OTA is also reduced. The simulations carried out in Cadence Spectre Environment confirm the theoretical results and illustrate that the proposed amplifier has a better figure of merits (FoMs) compared to its counterparts.

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Authors and Affiliations

  1. Department of Electronics and Communication Engineering, Vaagdevi College of Engineering, Warangal, India

    Sudheer Raja Venishetty

  2. Department of Micro and Nano Electronics, School of Electronics Engineering, Vellore Institute of Technology, Vellore, India

    Kumaravel Sundaram

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  1. Sudheer Raja Venishetty
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  2. Kumaravel Sundaram
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Correspondence to Sudheer Raja Venishetty.

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Venishetty, S.R., Sundaram, K. Improved transconductance multipath recycling folded cascode amplifier. Microsyst Technol 28, 1253–1266 (2022). https://doi.org/10.1007/s00542-022-05289-6

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  • DOI: https://doi.org/10.1007/s00542-022-05289-6

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