how to decrease corner difference

[lhlbluesky]

in many circuits, we use reference current to generate the bias current for the circuit module, but for different corner (tt ss ff sf fs), the bias current can have a big difference (about 20%), and so, the circuit parameter, such as slew rate, bandwidth, etc, has a big variation for different corner, also. i want to know, how to make the corner difference (bias current, SR, BW, osc frequency, etc) as small as possible? are there some methods to do this?

please help me, thanks.

 

[dick_freebird]

In the end you're at the mercy of diode variability (p,t) and
resistor sheets (p,t) which are generally not highly valued
process control attributes (especially in a flow that's modeled
by corners, that basically says they don't give a runny poop
about analog). If you want to make up for that your only
option is to start trimming.