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Input impedance of AD8220 with ADG1209

Question asked by cklooi on Jun 9, 2013
Latest reply on Jun 11, 2013 by NeilJ

In my previous design, AD8220 was chosen because of the requirement of the extremely high input impedance. However, I need to modify the circuit design by adding a demultiplexer to perform a 1 to 4 switch function and ADG1209 seems suitable for my design.

 

However, if I add an ADG1209 after AD8220, how will it affect the input impedance of the system?

I need to maintain a high input impedance.

 

I attach my AD8220 circuit design in this post. ADG1209 will be added after R11 and R12.

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