Enhancing OTA Voltage Gain using Wide Input Voltage Range Negative Impedance Converter without Compromising Phase Margin

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Rashtian M.

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Journal Paper

Paper Information

Journal: International Journal of Engineering Year:2025 | Volume:38 | Issue:12 Page(s): 2940-2952

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Title

Enhancing OTA Voltage Gain using Wide Input Voltage Range Negative Impedance Converter without Compromising Phase Margin

Author(s)

Rashtian M. | Issue Writer Certificate

Keywords

Negative impedance converter

Negative capacitance

Negative Resistance

Boosted opamp

Transconductance Operational Amplifier

Phase Margin

Abstract

This paper presents a wide input voltage range Negative impedance converter (NIC) circuit operating in weak inversion. A small signal analysis has been performed, resulting in a circuit model that characterises the input impedance function, Zin(s). A boosted folded cascode (BFC) OTA is presented using the proposed NIC. Incorporating the proposed NIC at the output node of a folded cascode (FC) OTA, the output impedance is increased, resulting in a noticeable improvement in the overall voltage gain without Phase Margin (PM) degrading. Post-layout simulation is performed using standard 180nm CMOS technology, while the two essential large resistors of the proposed NIC are considered off-chip components. The boosted OTA exhibits a DC gain improvement of 17 dB with no PM degradation over a conventional FC OTA at the expense of 1.5% more power consumption. The proposed NIC circuit can be incorporated easily into any boosted OTA realized by alternative methods. Based on this concept, a double-boosted OTA is also introduced.

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