TY - INPR TI - A High-Voltage Differential SPDT T/R Switch for Ultrasound Systems SN - 1549-8328 Y1 - 2024/07/25/ AV - public N2 - An improved bootstrapped circuit topology is proposed for the design of a high-voltage, differential, single-pole double-throw transmit/receive switch for an ultrasound hand gesture recognition system. The differential transmit/receive switch is designed in a 0.18 ? m HV BCD technology. It is intended to interface with bimorph piezoelectric micromachined ultrasonic transducer electrodes, although a single-ended version can also interface with conventional ultrasound transducers. A comprehensive analysis has produced useful insights, namely the dependence of off-isolation on high-voltage input slew rate, and the dependence of common-mode rejection ratio on threshold mismatch and timing misalignment. In addition, an extended model has been developed to predict harmonic distortion through a DMOS transistor. Measured results verify the effectiveness of the design guidelines and switch operation. The switch circuit exhibits 67 ? on-resistance and ? 63 dB off-isolation while occupying a modest area of 289 ? m в 295 ? m. The switch achieved a figure-of-merit with 74% improvement over the state-of-the-art. To the best of the authors? knowledge, this differential switch is the first of its kind reported for piezoelectric micromachined ultrasonic transducer biomedical ultrasound systems. UR - https://doi.org/10.1109/tcsi.2024.3426558 ID - discovery10195902 N1 - This version is the author accepted manuscript. For information on re-use, please refer to the publisher?s terms and conditions. KW - Bipolar-CMOS-DMOS (BCD) KW - MOSFET switch KW - high-voltage analog switch KW - single-pole double-throw switch KW - transmit/receive switch KW - ultrasound hand gesture recognition PB - Institute of Electrical and Electronics Engineers (IEEE) A1 - Zhang, Yaohua A1 - Jiang, Dai A1 - Demosthenous, Andreas JF - IEEE Transactions on Circuits and Systems I: Regular Papers ER -