Hi,
I'm trying to come up with a accuracy range estimate of a measurement circuit. Now my input analog voltage is in the range of 0-5V, and i'm putting it through a buffer and then some further circuitry, but i'm stuck on this first stage, i found this nice app note ( http://ww1.microchip.com/downloads/en/AppNotes/01177a.pdf ), that on page 5, fig 13 is what i'm looking at. Says the error from a buffer is composed of Vost which is shown in Equation 3, I cant seem to figure out where they get ΔVdd, ΔVcm, or where i myself would get them in my circuit. My 10V supply is a Regulator with 5% error, does that mean ΔVdd is 0.5V? what about ΔVcm? Because i added the 1k resistors (1%), would that further errors? any help is appreciated, thanks.
I'm trying to come up with a accuracy range estimate of a measurement circuit. Now my input analog voltage is in the range of 0-5V, and i'm putting it through a buffer and then some further circuitry, but i'm stuck on this first stage, i found this nice app note ( http://ww1.microchip.com/downloads/en/AppNotes/01177a.pdf ), that on page 5, fig 13 is what i'm looking at. Says the error from a buffer is composed of Vost which is shown in Equation 3, I cant seem to figure out where they get ΔVdd, ΔVcm, or where i myself would get them in my circuit. My 10V supply is a Regulator with 5% error, does that mean ΔVdd is 0.5V? what about ΔVcm? Because i added the 1k resistors (1%), would that further errors? any help is appreciated, thanks.
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