State Key Laboratory of Dynamic Measurement Technology， North University of China
Abstract： To enable multi-channel pulse transmission, data acquisition, storage, transmission, and analysis based on a capacitive micromachined ultrasonic transducer (CMUT) array, a 32-channel ultrasound transceiver board was designed based on the PXIe bus. This board utilizes a field-programmable gate array (FPGA) as the main controller and supports both transmission and reception modes. The modes are switched via a T/R switch. In transmission mode, the board drives the CMUT array to emit ultrasonic signals. In reception mode, it receives the analog echo signals from the CMUT, converts them into 14-bit digital signals via an ADC, frames and packages the data, buffers it through DDR3 memory, and transmits it to a PC via the PXIe interface. The paper elaborates on the system’s hardware circuits and FPGA logic design and verifies the design by driving a CMUT linear array to test an acrylic board. The test results demonstrate that the board meets the requirements of the CMUT array, and the system can be expanded to support more channels. This board provides hardware support for high-resolution ultrasound imaging and non-destructive testing applications.
Key words : FPGA；PXIe；CMUT；multi-channel；data acquisition；ultrasound imaging system
