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The regulator to convert a negative input voltage?

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katrin

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convert negative to positive voltage regulator

Dear All,

The normal regulator only converts the positive voltage and their substrate is ground.

Now I want to design a regulator, whose negative input voltage may exceed its negative substrate voltage.
For example, its input voltage is from -10V to +10V, I would like to convert it to constant voltage -5V to +5V. But the chip substrate is -5V. Of course, the ground is also available.

Usually, the chip substart should be connected to the most negative voltage potential, but in this case, when there is -10V at the input, the substrate is not the lowest potential for the whole chip any more.

Therefore, I would like to solve this problem and search for the design method of the regulator, or are there any papers on such kind of regulator?

thanks!
 

convert from negative to positive voltage

You need triple well technology. In that way you can put your PMOS transistors into a N-well and the NMOS into a P-well (biased to the lowest).

BTW Check the maximum voltage stress allowed by the technology
 

    katrin

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thanks

are there any papers with such kind of regulator schematic?



PaloAlto said:
You need triple well technology. In that way you can put your PMOS transistors into a N-well and the NMOS into a P-well (biased to the lowest).

BTW Check the maximum voltage stress allowed by the technology
 

are there any papers with such kind of regulator schematic?
 

The voltage doubler that you can read in the paper by Favrat is also to generate negative voltages
 

    katrin

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