Help me with a bias design that outputs 2 bias currents

[qslazio]

bias design

i'm going to design a bias circuit which will output 2 bias current.
The 2 current should meet: sqrt(I1)+sqrt(I2)=constant
Could anyone help me to find some good structure?
Thanks

 

[cetc1525]

bias design

maybe it's difficult.you can try to use cmos at saturation. it's Id is the square of the Vgs-Vt,maybe you can find some relations.

 

[simonkuo]

Re: bias design

You can refer to some of constant-gm rail to rail operational amplifier papers.
There are many circuits about that.

 

[vonleo]

Re: bias design

maybe translinear circuit is possible.