Design of a power-less integrated protection circuit for biomedical ultrasound transmit/receive

This paper proposes a novel architecture of design a high-voltage protection circuit for biomedical ultrasound signal transmission and receive. The protection circuit includes a transmission element and a voltage-driven switching block. The transmission element is composed of an impedance matching circuit coupled to the input terminal of the receiver, and the voltage-driven switching block detects a voltage value at the input of the transmission element. No power source is required for the device to operate at either high voltage or low voltage level. Simulation results show that the voltage isolation between the input and output node is over 30dB and the overall insertion loss is around 0.5dB over 100 MHz bandwidth.