Bandgap with a supply domain between 2.. 40V

[Tom_Sawyer]

Hello,

I have to design a bandgap reference with a very high supply range: 2V - 40V using BiCMOS HV technology.

I hope I can get topology suggestions.

My idea was to build 2 cascaded bandgaps before building the "real" bandgap which can be designed within a 4% error tolerance.

Best regards,

Tom

 

[gevy]

I can offer the following idea: a high input voltage low dropout regulator with output voltage about 1.6 ... 1.8 V and low input voltage bandgap.
What technology you will use? 0.6u, 0.25u, 0.18u or others?

 

[gevy]

I can offer the following idea: a high input voltage low dropout regulator with output voltage about 1.6 ... 1.8 V and low input voltage bandgap.
What technology you will use? 0.6u, 0.25u, 0.18u or others?

 

[Tom_Sawyer]

I will have to use a 0.8um technology.

I appreciate you help,

Tom

 

[Tom_Sawyer]

How do you mean that?

Do you mean a regulator which regulates the supply of the bandgap? what if there is no other supply than the 2.. 40V supply?

tOM

 

[gevy]

Yes, regulator provides input voltage for bandgap and bandgap is voltage reference for regulator. The blandgap consists of low-voltage transistors, which have the best parameters in comparison with high-voltage transistors. The start-up circuit is necessary, that it worked.
I think it will be difficult at low voltage (2V), as thresholds of MOS transistors are large for 0.8u, but BJT should help.

 

[cetc1525]

can you upload the BICMOS models.