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<p>This paper presents the realization of a CMOS current-mode 1/<i>X</i> function. The proposed circuit is derived from the Taylor series approximation of the inverse function and employs a MOSFET operating in the saturation region. The design exhibits robustness against Process, Voltage, and Temperature (PVT) variations. Functionality is verified using CADENCE Virtuoso simulations in 180nm TSMC CMOS technology. The circuit operates from a ±1.25V DC supply and supports a normalized input range of ±1. Simulation results show a maximum temperature-induced error of ±0.13dB over a <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(100^{\,\circ }\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mn>100</mn> <mrow> <mspace width="0.166667em" /> <mo>∘</mo> </mrow> </msup> </math></EquationSource> </InlineEquation>C variation. The design maintains accuracy for applications up to &#xa0;1 MHz within the normalized input range. The proposed circuit is a fundamental building block for time-mode analog-to-digital converters (ADCs) that rely on voltage/current-to-time conversion.</p>

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Realization of a CMOS Current-Mode PVT Independent 1/X Function

  • 期刊论文

  • 发表日期：

    2026年3月7日

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  • Muneer A. Al Absi,
  • Mazen Abouelezz

摘要

This paper presents the realization of a CMOS current-mode 1/X function. The proposed circuit is derived from the Taylor series approximation of the inverse function and employs a MOSFET operating in the saturation region. The design exhibits robustness against Process, Voltage, and Temperature (PVT) variations. Functionality is verified using CADENCE Virtuoso simulations in 180nm TSMC CMOS technology. The circuit operates from a ±1.25V DC supply and supports a normalized input range of ±1. Simulation results show a maximum temperature-induced error of ±0.13dB over a \(100^{\,\circ }\) 100 ∘ C variation. The design maintains accuracy for applications up to  1 MHz within the normalized input range. The proposed circuit is a fundamental building block for time-mode analog-to-digital converters (ADCs) that rely on voltage/current-to-time conversion.