:: voltage reference 1/f noise mitigation ??

by using an active capacitor guard over another capacitor to mitigate capacitor leakage, ver ylarge capacitor can be used to drive down 1/f noise (in theory)

using 1 RC




using 2RC







full 3 channels of noise @ 10vpp reduction to 1vpp

using real capacitor data eg: vishay 25F x3 in series giving 8.33F. theoretical settling time is 37days! 1/f reduction is 1:25

for a VREF, 3uV rms noise will mean reduction to 0.12uV.

the only other way to achieve this is to parallel 625 units of the VREF itself. but the leakage/instability of the capacitors makes the VREF useless. unless ...