A System Platform Design of Travelling Wave Dielectrophoresis Microchip Based on SOPC

This paper presents a control and acquisition platform design method of travelling wave dielectrophoresis microchip based on SOPC technique. The direct digital frequency synthesis (DDS) modeling is built by using the digital signal processing (DSP) development tool of FPGA, DSP Builder. By the controlling of NIOSII, which embedded in the FPGA (CyclonII EP2C35) of Altera corp., the four-phase DDS module outputs four channels AC signals with the same magnitude, and their phase of four channels AC signals are 0deg, 90deg, 180deg and 270deg, respectively. They supply control signals for the travelling wave ITO electrodes array. The travelling wave dielectrophoresis electric field is created by the four-channel AC signals, it drives biological particles direction moving to achieve different biological particles separating in the microchannel of dielectrophoresis micochip. Adopting the custom I²C module achieves the configuration of 3-Megapixel CMOS image sensor, MT9T001, which achieves the contactless detection of different biological particles. The design of DDS IP core based on DSP Builder, the design of custom I²C module, the hardware framework and software design of control system is mainly introduced in article. The correctness and practicability of design method is testified by simulation results.