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TL084IDR的2个难题

电流采样电路如下


参数:输出正弦波频率50hz
开关频率:2.5k
问题1:Mathcad算出的相频曲线和TINA仿真的为什么不一样?

电路的传递函数为:

 

相频函数:

 

问题2:根据相频曲线怎么计算整个采样电路的延时?

TL084ID的技术问题.pdf