The regulator to convert a negative input voltage?

[katrin]

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!

 

[PaloAlto]

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]

thanks

are there any papers with such kind of regulator schematic?

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]

are there any papers with such kind of regulator schematic?

 

[PaloAlto]

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