i have a bias current generator. the output current is copied to many branches via current mirrors, and will be used through different resistors and diode connected transistors.

now i want to check the influence of the supply voltage fluctuation on the generated current. i just use a 'xf' simulation to check it. however, different PSRR values appear at different current branches (i already normalize the value to the unit current), which implies that the PSRR of this current is also depending on the property of the load. is this true? or are there any other more reasonable way to check the PSRR of this current output?

thanks.

raja.cedt wrote on Sep 22^nd, 2009, 9:36pm:


hi,

which mosfet are you referring to? the mirror transistor or the diode-connected transistor? and actually in my case neither of those is identical in every branch.

thanks.