caosl
Advanced Member level 4
hi,all
I need a constant current reference in my circuit, it's value is about 1uA.I summed a PTAT current from bandgap and a CTAT current to achieve this target, it's TC performance is ok, but the resistance's value will departure 20%, so the current value will change at different corners.Anyone has an idea to design a current reference which only relevant to resisitance's ratio more than it's absolute value.Any advice is welcome,thanks!
I need a constant current reference in my circuit, it's value is about 1uA.I summed a PTAT current from bandgap and a CTAT current to achieve this target, it's TC performance is ok, but the resistance's value will departure 20%, so the current value will change at different corners.Anyone has an idea to design a current reference which only relevant to resisitance's ratio more than it's absolute value.Any advice is welcome,thanks!