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A capacitively coupled contactless conductivity detection (C4D) method of capillary electrophoresis microchip based on orthogonal vector lock-in amplifier on FPGA is presented. The digital orthogonal vector lock-in amplifier is configured by assembling LPM MULT, ALTMULT ADD, Low-pass Filter and other IP core. The orthogonal driving signals are generated by custom DDS IP core based on DSP Builder software,...
A modeling and simulation methodology for in-plane four-electrode capacitively coupled contactless conductivity detector of capillary electrophoresis microchip (IFC4D) is presented with the VHDL-AMS modeling language. The VHDL-AMS-based basic compact models of IFC4D are developed, such as the equivalent resistance models of solution, the plane coupling capacitance models. The time-domain and frequency-domain...
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...
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