A Control and Acquisition System Design of Low-voltage Electrophoresis MicroChip Based on SOPC and DDS

This paper presents a method to control and acquire the conductivity signal of low-voltage capillary electrophoresis microchip based on SOPC and DDS techniques. The soft-core processor with RISC framework, NIOS II, acts as the core component. Under the control of NIOS II, the electrode ports are movably supplied DC voltage by the 128-channel electrodes address decoding strobe controller, and the moving field is formed to achieve of the different particles separating in the microchannel of low-voltage electrophoresis microchip. The direct digital frequency synthesis (DDS) modeling is built by DSP Builder. The DDS IP core is generated by Quartus II software. To control the dual phase lock-in amplifier by the DDS orthogonal signals sources. The four-electrode capacitively coupled contactless conductivity detector is designed to achieve the conductivity detection of solution. The design of DDS IP core based on DSP Builder, hardware framework and software design of system are mainly introduced in article.