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Updated: Sep 27, 2026

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
Published on: February 4, 2018
A Capacitively Coupled OOK Transmitter with 4.43 dB Simulated Carrier Spectrum Peak Reduction and Enhanced CMTI for
Ningye He1, Jiahao Li2, Yongbin Huang2
1Engineering Technology Research Center of Intelligent Microsystems AnHui Province, Huangshan University, Huangshan 245021, China.
Abstract:
This paper addresses the trade-off between electromagnetic interference (EMI) and common-mode transient immunity (CMTI) performance in capacitively isolated gate drivers for high-frequency silicon carbide (SiC) applications. Starting from the fundamental architecture of on-off keying (OOK) modulation, a novel transmitter (TX) modulator architecture is proposed. The proposed architecture employs a dynamic high-frequency carrier regulation circuit to suppress electromagnetic interference caused by the fixed carrier at the spectral source, while simultaneously utilizing a dynamic substrate regulation circuit to mitigate the impact of common-mode transient interference on the TX side, thereby enhancing the overall CMTI performance. The chip is fabricated in a 0.18-μm BCD process. Simulated carrier spectrum peak attenuation across different process-temperature corners demonstrates that the attenuation ranges from 4.43 dB to 19.621 dB across the fundamental through the third harmonic components. Under the same typical process-temperature corner, the simulated CMTI reaches 220 V/ns, which fully validates the effectiveness of the proposed architecture in both spectral peak reduction for EMI suppression and CMTI enhancement. Post-fabrication chip testing primarily focuses on output performance, with both the simulated carrier spectrum results for EMI and the CMTI being simulation-verified indicators. The measured output voltage range is 15-24 V; at a supply voltage of 15 V, the charging and discharging currents are 5 A and 4.5 A, respectively, and at 24 V, they are 5.7 A and 5.3 A, respectively.
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