【摘要】 探讨了一种基于SoPC的电泳芯片电导检测系统设计方案。采用MAX038函数发生器产生同步的正交信号源,采用双差分减法器实现阻抗到电压的变换,并利用双相锁定放大器实现电导幅值及相位检测,以FPGA内嵌NiosII软核处理器为系统控制核心,运用SoPC Builder定制高速采集控制器、FFT控制器以及运用IP核FFTV2.1.3构建实时高速长度为1 024点的FFT变换模块实现电泳芯片电容耦合非接触电导时、频域分析。文中具体阐述了系统软、硬件架构及自定制NiosII处理的FFT算法指令等。仿真结果表明:该方案能进行复杂数据处理,具有快速实时处理能力,能有效保证系统的抗干扰性和测量准确度。更多还原

【Abstract】 A kind of measurement system design of capillary electrophoresis microchip based on SoPC technology was described.The synchronous orthogonal signals were obtained by using MAX038 high frequency waveform generator,the impedance was converted to voltage based on the dua1 differential subtraction,the magnitude and phase of the signal conductivity were detected by using the dual lock-in amplifiers,the embedded software core processor.NiosII,acted as the key and kernel controlling module in FPGA,the FFT controller and the high speed signal sampling controller,which were defined by SoPC Builder software,and the ultra-high speed,real-time FFT transform module,which was designed using FFT V2.1.3 IP core,and the time domain and frequency-domain analysis of capacitive coupled contactless conductivity in electrophoresis microchip were achieved.The architecture of software and hardware in measurement system and the custom FFT instruction for NioSII embedded processor were discussed.The simulation experimental results show that this project scheme can process the complex data computing,having quick and real-time processing ability,it can effectively ensure system anti-jamming ability and the accurate measurement.更多还原