Design of Digital Circuit Experiment Course Based on FPGA

With the development of integrated circuit, the content of digital circuit experiment course is constantly updated. In order to keep up with the development trend of the Times and make students’ professional knowledge meet the needs of the industry, the school adopts the FPGA experimental platform to carry out teaching reform from the two aspects of platform and experiment, and carry out reasonable experimental planning to enrich the experimental content. In this paper, the traditional knowledge points of logic algebra, trigger, timer, counter, decoder and digital tube are organically combined, and the digital clock system is designed and realized. The practice shows that the combination of modern design method and traditional digital circuit teaching method can play a good teaching effect. In this way, students can also fully learn, understand and skillfully use the new technology in the experiment, and in the process of building a comprehensive understanding of digital circuits.

FPGA-based high resolution DPWM control circuit

Two improved structures of high resolution digital pulse width modulator(DPWM) control circuit are proposed. Embedded digital clock manager(DCM) blocks and digital programmable delay circuits are employed as the basic resources to construct the field-programmable gate array(FPGA)-based DPWM implementations. Detailed schemes are illustrated and the circuits have been successfully implemented on the Artix-7 FPGA device developed by Xilinx. Experimental results show that when the basic clock operates at the frequency of 200 MHz, the resolutions of the two approaches can reach 625 ps and 500 ps, respectively. Besides,the presented schemes possess other merits including flexible resolution, strong versatility and relatively good stability.