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Abstract <p>The paper presents a gain-enhanced operational amplifier (Op-Amp) that offers both high bandwidth and phase margin. To enhance the phase margin, a Miller compensation technique incorporating a branch with a resistor and a capacitor connected in series has been employed. The cascoding of Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFET) has been done to raise the output impedance, thus increasing the Op-Amp’s gain. An Alternating Current (AC) analysis has been conducted to assess parameters such as unity-gain frequency, gain, Phase Margin (PM), and gain-bandwidth product. Utilizing an input voltage of 1.8 V and a 0.75 pF compensation capacitor, a gain of 104.1 dB and a PM of 73.78 degrees were achieved. This high-gain cascoded operational amplifier is suitable for applications in bandgap voltage references and filters.</p>

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Gain Enhanced Miller Compensated Operational Amplifier

  • 期刊论文

  • 发表日期：

    2025年7月14日

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  • Komal Duhan,
  • Dr. Neelam Rup Prakash,
  • Dr. Jasbir Kaur,
  • Sameeksha Munjal

摘要

Abstract

The paper presents a gain-enhanced operational amplifier (Op-Amp) that offers both high bandwidth and phase margin. To enhance the phase margin, a Miller compensation technique incorporating a branch with a resistor and a capacitor connected in series has been employed. The cascoding of Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFET) has been done to raise the output impedance, thus increasing the Op-Amp’s gain. An Alternating Current (AC) analysis has been conducted to assess parameters such as unity-gain frequency, gain, Phase Margin (PM), and gain-bandwidth product. Utilizing an input voltage of 1.8 V and a 0.75 pF compensation capacitor, a gain of 104.1 dB and a PM of 73.78 degrees were achieved. This high-gain cascoded operational amplifier is suitable for applications in bandgap voltage references and filters.