Hi,
Pls. see the attached schematic. It is a supply -independent current sourrce, there is a capacitor C1(which is always implemented by a PMOS cap). Can anyone pls. tell me the functions of this capacitor?
Is it a decoupling cap to increase the PSRR??? And how we can select the value of it?
sunking:
do you really think it that? yet i consider it as a decoupling capacitor to suppress the interference and noise.
If i'm wrong, would you please annotate it?
INDEX: reference decouple capacitor
John Xu, I agree with you. I think it is a decoupling cap to increase the PSRR.
it's value depend on current flow on the middle leg of figure!, noise attenuation and frequency which we want to eliminate (eg. 50Hz).