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High Speed Summing Circuit using AD8130 (from AD-guide)

Question asked by lyto on Feb 25, 2016
Latest reply on Mar 7, 2016 by lyto

Hello alltogether,

 

I am currently developing a circuit for an important application that will be produced at a moderate number of pieces, so I need to know if the following AD components and schematic suits my purpose.

I need a fast summer circuit with high input impedance for several single ended input signals that are provided by several instrumentation amplifiers.

 

I found a schematic in "A Designers Guide to Instrumentation Amplifiers" (from AD, http://www.analog.com/en/education/education-library/dh-designers-guide-to-instrumentation-amps.html)  in Chapter VI, Page 6-12. The schematic describes a summing Circuit with High Input Impedance and four inputs using AD8130. You can see the circuit below:

AdSummingCirc.jpg

I would like to know if it is possible to connect even more AD8130 to build a Summing Circuit with more Inputs (would look like a tree chart), without disturbing the signal quality and bandwidth. How will this affect the performance of the circuit? I attached a possible circuit below (green components added):

adSumming2.png

Thank you,

Regards

Jepic

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