Ask a question about RC filter design at SAR ADC input terminal.

Hi,
Below equation is described in this article” Front-End Amplifier and RC Filter Design for a Precision SAR Analog-to Digital Converter”.

But now, I do not know how to derive this equation correctly, would you please show me the detailed calculation? Furthermore, if the output impendence of the front end amplifier is considered, is the NTC the same with this equation or expressed in another way?

Thanks!

Top Replies

    •  Analog Employees 
    Aug 10, 2021 +1 verified

    - yes, I spent quite a bit of time trying to make sense of the equations in that paper as well!

    The equation above is a variation on a capacitor discharge equation, as illustrated in https://www…