What question did this study set out to answer?

This research focuses on enhancing the common mode transient immunity of a capacitively coupled gate driver using OOK modulation.

February 26, 2026IEICE Electronics Express0 citationsOpen Access

A capacitively coupled SiC MOSFET gate driver using dv/dt enhanced OOK transmitter with CMTI of 220V/ns

JLJie LiHarbin University of Science and Technology JLJicun Lu RTRuifang TieHuangshan University

Key Points

This research focuses on enhancing the common mode transient immunity of a capacitively coupled gate driver using OOK modulation.
Developed modulation circuit for enhanced CMTI
Integrated CM substrate modulation with OOK transmitter
Collaborated with CM interference detection circuit for better accuracy
Achieved 220 V/ns CMTI
Demonstrated a 20 ns propagation delay
Measured rise and fall times of 10 ns and 12 ns under 15 V supply
Rise and fall times of 22 ns and 24 ns recorded under 30 V supply
Operated at a frequency of 2.5 MHz with a 3.5 nF load

Abstract

This paper presents a high Common Mode Transient Immunity (CMTI) modulation circuit for a capacitively coupled gate driver. It proposes an enhanced on-off keying (OOK) transmitter architecture with integrated common-mode (CM) substrate modulation. Through collaboration with the CM interference detection circuit, transmission accuracy and CMTI are improved without additional delay.Test results show the prototype driver achieves 220 V/ns CMTI, 20 ns propagation delay, the rise and fall times of 10 ns and 12 ns respectively under 15 V supply voltage, and the rise and fall time of 22 ns and 24 ns respectively under 30 V supply voltage with 2.5 MHz frequency and 3.5 nF load.

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