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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,...
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