Bandgap with a supply domain between 2.. 40V

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Tom_Sawyer

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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
 

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?
 

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    Tom_Sawyer

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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?
 

I will have to use a 0.8um technology.

I appreciate you help,

Tom
 

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
 

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.
 

can you upload the BICMOS models.
 

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