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Offset voltage for an charge amplifier

Category: Hardware
Product Number: AD7091R

Hello,

Regarding the Two-Chip Data Acquisition System for Piezoelectric Sensors CN0350, I am wondering why not simply use a voltage divider to generate the offset voltage HREF? What would be the disadvantages of leaving out the op amps U1B and U1C and just using the resistors R1 and R2? A more detailed description of the working principle would be helpful.

Thanks for your answer!

Greetings,

Thomas