A New 80V 32x32ch Low Loss Multiplexer LSI for a 3D Ultrasound Imaging System

This paper presents a new concept for an 80V multiplexer LSI with the world's largest 32 times 32ch cross-point switches for a real-time 3D ultrasound imaging system. This system requires hundreds of thousands of high voltage electrical switches. We propose a new gate floating type analog switch circuit with thin gate oxide power MOSFETs and a low-loss gate driving method for this LSI. The developed LSI can handle plusmn40V at 15 MHz ultrasound signal with reasonably low power dissipation (10mW/LSI) and can operate at a 33 MHz clock frequency for the first scanning operation. The developed LSIs are assembled in a hand probe and show a fine 3D volume image