Design and implementation of CMOS interface circuits for high voltage automotive signals, with fully integrated clamps


Research paper entitled “CMOS Interface Circuits for High-Voltage Automotive Signals” from the University of Parma and Silis srl

“Acquiring high voltage signals from sensors and actuators in an internal combustion engine is often necessary for diagnostic purposes or in the case of a conversion to alternative fuels, such as hydrogen, gas natural or biogas. The integration of electronic interfaces and acquisition circuits in a single device offers advantages in terms of reduced component count and performance. However, the high voltage level of the signals involved makes on-chip design difficult. Additionally, the circuits must be CMOS compatible, with limited use of high voltage options and a minimum number of off-chip components. This article describes the design and implementation in 350 nm CMOS technology of electronic interfaces and high voltage signal acquisition circuits typical of the automotive context. In particular, a novel co-design of dedicated voltage clamps with electrostatic discharge (ESD) protections is described. The proposed circuits require only a single off-chip resistor and are suitable for acquiring signals with peak voltages up to 400 V. The measured performance of the silicon prototypes, in the [−40 °C, +125 °C] temperature range, making the proposed electronic interfaces suitable for the automotive field.

Find the technical document in free access here. Published in March 2022.

Boni, A.; Caselli, M.; Magnanini, A.; Tonelli, M. CMOS interface circuits for high voltage automotive signals. Electronics 2022, 11, 971.

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