# A Generic EMI-Immune Technique for Differential Amplifiers With Single-Ended Output

Anjan Kumar Pudi N S, Jean-Michel Redoute, Maryam Shojaei Baghini

Research output: Contribution to journalArticleResearchpeer-review

### Abstract

This paper presents a unique methodology to calculate the filtering capacitances of the OpAmp already reported in the literature. The methodology aims to show that there is an optimal solution that can be used to increase the electromagnetic interference (EMI) immunity of any OpAmp for a wide range of frequencies. By using this proposed methodology, an OpAmp structure that reduces the EMI effect is designed in standard <formula><tex>$0.18\ \mu \text{m}$</tex></formula> mixed-mode CMOS technology. Detailed mathematical analyses and simulation results are presented and discussed. Simulation results show that the maximum EMI-induced offset voltage in the frequency range from 1 MHz to 1 GHz for the OpAmp is 4.4&#x00A0;mV. In contrast, the standard Miller OpAmp exhibits a maximum EMI-induced offset voltage of 92.4&#x00A0;mV under the same operating conditions.

Original language English 958-964 7 IEEE Transactions on Electromagnetic Compatibility 60 4 https://doi.org/10.1109/TEMC.2017.2759785 Published - 1 Aug 2018

### Keywords

• Capacitance
• Capacitors
• CMOS
• Electromagnetic interference
• electromagnetic interference (EMI) immunity
• Immunity testing
• Logic gates
• Transistors

### Cite this

Pudi N S, Anjan Kumar ; Redoute, Jean-Michel ; Baghini, Maryam Shojaei. / A Generic EMI-Immune Technique for Differential Amplifiers With Single-Ended Output. In: IEEE Transactions on Electromagnetic Compatibility. 2018 ; Vol. 60, No. 4. pp. 958-964.
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abstract = "This paper presents a unique methodology to calculate the filtering capacitances of the OpAmp already reported in the literature. The methodology aims to show that there is an optimal solution that can be used to increase the electromagnetic interference (EMI) immunity of any OpAmp for a wide range of frequencies. By using this proposed methodology, an OpAmp structure that reduces the EMI effect is designed in standard $0.18\ \mu \text{m}$ mixed-mode CMOS technology. Detailed mathematical analyses and simulation results are presented and discussed. Simulation results show that the maximum EMI-induced offset voltage in the frequency range from 1 MHz to 1 GHz for the OpAmp is 4.4 mV. In contrast, the standard Miller OpAmp exhibits a maximum EMI-induced offset voltage of 92.4 mV under the same operating conditions.",
keywords = "Capacitance, Capacitors, CMOS, Electromagnetic interference, electromagnetic interference (EMI) immunity, Immunity testing, Load modeling, Logic gates, Transistors",
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A Generic EMI-Immune Technique for Differential Amplifiers With Single-Ended Output. / Pudi N S, Anjan Kumar; Redoute, Jean-Michel; Baghini, Maryam Shojaei.

In: IEEE Transactions on Electromagnetic Compatibility, Vol. 60, No. 4, 01.08.2018, p. 958-964.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Baghini, Maryam Shojaei

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AB - This paper presents a unique methodology to calculate the filtering capacitances of the OpAmp already reported in the literature. The methodology aims to show that there is an optimal solution that can be used to increase the electromagnetic interference (EMI) immunity of any OpAmp for a wide range of frequencies. By using this proposed methodology, an OpAmp structure that reduces the EMI effect is designed in standard $0.18\ \mu \text{m}$ mixed-mode CMOS technology. Detailed mathematical analyses and simulation results are presented and discussed. Simulation results show that the maximum EMI-induced offset voltage in the frequency range from 1 MHz to 1 GHz for the OpAmp is 4.4 mV. In contrast, the standard Miller OpAmp exhibits a maximum EMI-induced offset voltage of 92.4 mV under the same operating conditions.

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