find some advices about a wide input current reference

[zj850908]

Hi,all
Now, i want to design a current reference circuit with standard 0.35 TSMC tech. The only spec is that it has a wide range of Vdd(3-10V).
Any suggestions would be greatly appreciated.

 

[kishore2k4]

You can use a bandgap reference to generate it.

I don't remember the name of the circuit but you can also use a a simple n-channel current mirror(1:N) with a resistor between the source and ground of N-size MOSFET. The load for both the transistors is a p-channel current-mirror load. I think it is some variation of Wilson current mirror.

 

[zj850908]

You can use a bandgap reference to generate it.

I don't remember the name of the circuit but you can also use a a simple n-channel current mirror(1:N) with a resistor between the source and ground of N-size MOSFET. The load for both the transistors is a p-channel current-mirror load. I think it is some variation of Wilson current mirror.

I know the circuit that you said. But the key point of the reference is that when vdd is 3v, it can work ,aslo when vdd is 10v. At the same time, we must guarantee every transisitors without overstress,which means the transisitor's Vgs,Vds,Vgb are not exceed 5V(because we use the 5V transisitor).
Because when the vdd is 10v,it also can work,so we use the cascode structure.But this leads it can't work when vdd is 3v.

 

[JoannesPaulus]

Can't you use a simple voltage regulator that generates your internal 3V suppl?.

 

[zj850908]

Can't you use a simple voltage regulator that generates your internal 3V suppl?.

Is it easy to realize a simple votage regulator that generates 3v supply form 10v Vin without high-voltage transisitor?