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提出了一种采用基于电流模的放大器和滤波器电路设计方法,并利用第二代电流传输器CCⅡ实现了三阶巴特沃思低通电流模滤波器。在对第二代电流传输器结构和原理进行分析的基础上,利用CCⅡ设计了三阶巴特沃思低通电流模滤波器,并把R和C提取到CCⅡ芯片外面使它更好应用于低频荧光信号测量。电路经过Pispice的仿真证明了电路的可行性,从而提高了荧光信号检测电路的速度和信噪比,使得检测精度大大提高。本文提出的方法正确、原理清楚、电路可行。并且,电流模技术为微弱荧光信号的低噪声测量、放大和滤波提供了一条可行的技术路线。
A design method based on current mode amplifier and filter circuit is proposed, and a third-order Butterworth low-pass current mode filter is realized by using the second-generation current transmitter CCII. Based on the analysis of the structure and principle of the second-generation current transmitter, the third-order Butterworth low-pass current mode filter is designed by CCⅡ, and R and C are extracted outside of the CCⅡ chip so that it is better applied to the low frequency Fluorescence signal measurement. The simulation of the circuit through Pispice proves the feasibility of the circuit, thus improving the speed and signal-to-noise ratio of the fluorescent signal detection circuit, so that the detection accuracy is greatly improved. The method proposed in this paper is correct, the principle is clear, the circuit is feasible. Moreover, the current mode technique provides a viable technical route for low-noise measurement, amplification and filtering of weak fluorescence signals.