In this paper, a high-speed data transmission system for high-frequency ultrasonic radio frequency echo signals based on FPGA and a single-element high-frequency broadband transducer were designed. With the FPGA as the core control processor, it controlled the transmission and reception of ultrasound and the upload of radio frequency data through the USB3.0 interface. In the interactive display software interface of upper computer designed under the development environment of visual studio 2012, the waveform preview and storage of the original RF data received by the 50 MHz single element broadband transducer were completed. Through the sawtooth wave simulation experiment and the plexiglass ultrasonic echo radio frequency signal acquisition experiment, it was concluded that the radio frequency data transmitted by the experimental system to the host computer was correct. The experimental system had reasonable design, error-free signal transmission, and high integration. The written waveform preview interface of the upper computer application software could not only meet the experimental debugging of subsequent research, but also the stored raw radio frequency data in multiple formats satisfy the subsequent further scientific research.

Objective To design and develop a kind of portable A/P mode ophthalmic ultrasonic biometry system. Methods The hardware were included ultrasonic emission circuit of 10 MHz and 20 MHz frequency to measure A mode and P mode, respectively. The echo signal was magnified and digitalized by A/D converter with 200 MHz frequency and 12 bits precision, and the obtained digital signal was performed digital signal processing by programmable gate array(FPGA). The power supply of whole hardware system was USB interface with 5 V and 500 mA. The functions of computer software system were included human-computer interface, data acquisition, display and print. Results The portable PCB circuit board(105 mm × 40 mm) was designed for high frequency ultrasonic signals, acquisition and digital signal processing, the transmission and control of data to computer by USB interface. Conclusion It is demonstrated that ophthalmic ultrasonic biometry system is portable, compatible with reliable data, which could meet the requirements for clinical application.