基于SoPC的行波介电电泳芯片控制与采集平台设计

Control and Acquisition Platform for Travelling Wave Dielectric Electrophoresis Chip Based on SOPC

介绍了一种利用SoPC技术控制与采集行波介电电泳芯片的方案。以嵌入在FPGA(CyclonII EP2C35)中的RISC结构的CPU软核NiosII为基础,通过FPGA的DSP开发工具DSP Builder对直接数字频率合成器(DDS)进行建模,在QuartusII软件中生成DDS IP核,控制输出4路相位严格相差90°的正弦波,建立行波电场驱动不带电生物粒子定向移动,实现不同生物粒子的分离;采用自定制I2C模块,实现300万像素CMOS图像传感器MT9T001的配置,完成不带电生物粒子的非接触检测。文中重点介绍了基于DSP Builder的DDS IP核设计,自定制I2C模块以及系统软、硬件设计,并通过仿真分析证明了这种设计方法的正确性和实用性。

This paper presented a SOPC-based design of the control and acquisition platform for travelling wave dielectrophoresis microchip. The direct digital frequency synthesis （DDS） modeling was built using the digital signal processing （DSP） development tool of FPGA, DSP Builder. The DDS IP core was generated by Quartusll software. By the controlling of soft-core processor with RISC framework, NIOSII, which was embedded in the FPGA （Cyclonll EP2C35）, the four-phase DDS module with 90 degree phase shift drive four channels AC signal outputs. The resultant travelling wave dielectrophoresis electric field drove the biologic particle without charge direction moving, to achieve biologic panicle separation in dielectrophoresis microchip. Adopting the custom I^2C module, the configuration of 3-Megapiexel CMOS active-pixel digital image sensor, MT9T001, implemented the contactless detection of the different biologic particle without charges. The design of DDS IP core based on DSP Builder, the design of custom I^2C module, the hardware framework and software design of control system were introduced. The simulation results demonstrated the feasibility of the design.