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ADS1263的阻抗匹配

Other Parts Discussed in Thread: ADS1263

我设计了一款四阶RLC低通滤波电路来与ADS1263的输入阻抗进行阻抗匹配,但是在PGA使能的情况下,ADS1263的输入阻抗是1G欧姆,这样的话我用史密斯圆图,将四阶RLC低通滤波电路来与ADS1263的输入阻抗进行阻抗匹配,将无法实现,大家能解决这个阻抗匹配问题吗,急求!!!