Bandgap Reference : Ground current < 1uA

[raduga_in]

Hi All,

Can someone tell me where can I get references for a bandgap reference ckt with the
ground current < 1uA ?

TIA

Raduga

 

[gevy]

Yes, but resistors will be large and circuit will have very slow.

 

[raduga_in]

Thanks gevy .. can you please provide me any reference paper / doc regarding this ?

TIA

Raduga

 

[leo_o2]

Yes. I designed one. Any conventional BG structure can be adopted. Very small current (for example:50nA) can be used for a branch. One important thing is to check noise performance because small current design might lead to big 1/f noise.

 

[jecyhale]

I hear my colleagues design power managerment circuit, there is bandgap which current is less than 1uA. I think a big value resistor is necessary.

 

[raduga_in]

Thanks leo_02 and jecyhale for your reply..

is there any possible ref. from the literature you can quote for
such a type of bandgape ref. .. like IEE/IEEE papers etc ..

TIA
Raduga

 

[layes2]

big mismatch will happen

 

[fredflinstone]

low current means you will have to worry about the BJTs saturation currents at high temperatures.. IS increases with temp and this affects your transistors beta.

 

[she_long]

I am going to design a low_power bandgap (Ivdd<1uA,vdd=3.3) use UMC 0.18 process.
Have somebody the experience how to choose the collector current of PNP? and how's the mismatch?
Thanks

 

[llbaobao]

I saw a bgr with most of its tr worked in subthreshold area. and with about several Mohm res.
a branch of the circuit only consume 10-50nA.
but may be need LPF to decrease its noise.