高速AD前端高频信号分压电路研究

oday,high-speed AD in the whole digital control circuit design plays a very important role,and the front-end of the high-speed AD sampling circuit as well as the key part.The commonly used voltage divider for signal attenuation in the signal conditioning circuit adopts simple resistance network and capacitance network.However,in the high-frequency circuit,Because of some previously unknown factors (e.g., parameter difference between the electronic components of different manufacturers, parasitic capacity and inductance on the component pin),these two bleeder circuits hardly meet the practical need.In this paper,on basic of practical engineering project,a simple and practical high-frequency signal dividing circuit method was proposed.This method is based on the traditional partial pressure circuit,combined with the oscilloscope probe circuit theory.Experimental data and analysis results show that at high-frequencies the proposed partial pressure method was superior to the conventional method of dividing.