An FPGA based generic prototyping platform employed in a CMOS laser Doppler blood flow camera

Abstract

This paper presents an FPGA based generic prototyping platform employed in a CMOS laser Doppler blood flow imaging application. The proposed platform consists of a Xilinx Spartan-3 FPGA device, Analog Device 125MSPS, 14-bit ADCs, Cypress 167MHz, 2Mtimes18bits QDR memory, and a highspeed (480MHz) USB 2.0 link. In this platform, the FPGA device not only acts as controllers of the ADCs, QDR memory and the USB link, but also provides a high-speed FFT processing capability, which is a key computation in laser Doppler blood flowmetry. Based on this platform, with the number of FFT points of 1024, a full-field laser Doppler blood flowmetry imaging system can deliver flow image frames (256x256 pixels) every 1.7 seconds, which is seven times faster than existing systems