BUT I HAVE THE QUESTION
if the psrr-( vout vs gnd) is large such as (-70db)
when the gnd became larger ,the vout become smaller than the gnd
how can i get the vout as my reference because the vout-gnd is reference voltage
if the if the psrr-( vout vs gnd) is small such as (-4dcb)
when the gnd is float the vout become larger the vout become large as the gnd
but the vout-gnd may keep a constant value as my reference
this is my idea for the question
hope for your replies
I think PSRR- is not necessary and if u do it it shows very less, bcoz only R's in that sig path..
in case of source ,sink ldo which is capable of providing i in both dirs then psrr from + and PSRR- id=s very imp concerns.