2.5 Voltage bandgap reference

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jerry.tran007

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Dear all,

I am doing my project about delta sigma modulation, it is needed a bandgap reference circuit for 2.5 voltage (because when changing VDD, my output is changed).

Is it possible for 2.5V bandgap circuit ? (my VDD is 3.3, using 0.13um tech).

Please help me.
 

there are also ICs that provide a voltage reference.................
 

I think in this case you would be better off with LDO-like structure. So make nice flat bgap and feed it as reference to ldo - this way you will have flat voltage over temp. You can generate 2.5V directly if you dump current reference to resistors - but I would think you will have a bit problem to compensate it over temp.
 

If the supply voltage is very stable, then using a resistor divider to get the reference voltage is feasible. Using Metal Film Resistors would alleviate much of the temperature drift.
 

because I design using CMOS transistor, I cant use another IC. my VDD is requred about 3 to 3.6V, so I cant use resistor divided too.

Dear Mr Teddy,
do you have any idea about LDO circuit or any paper for beginner? I never design bandgap circuit before.
 
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