voltage source independant current source

[a.zar]

Hi,

I am looking for a CMOS current source that provides constant current while its voltage source changes between 0.7V to 2V. Any help would be so much appericiated!

 

[leo_o2]

Use deplete NMOS.

 

[a.zar]

I don't have access to deplet nmos. I am new to analog design, is there any specific schematic that I can use?

Thanks.