Reference voltage generator with programmable thermal drift
AssigneeSGS-Thomson Microelectronics S.A.
InventorsVanni Poletto, Massimiliano Brambilla
Life of this patent
Estimating the term…
Abstract
The generator comprises a first generator of voltage with thermal drift of zero, a second generator of voltage with given thermal drift, first means for applying a given load to the voltage generated by the first generator, second means for applying a given load to the voltage generated by the second generator, subtracting means for subtracting one from the other the loaded voltages generated by said first and second generator of voltage.
Claims16
Reference voltage generator, characterised in that it comprises a first generator of voltage with thermal drift of zero, a second generator of voltage with given thermal drift, first means for applying a given load to the voltage generated by the first generator, second means for applying a given load to the voltage generated by the second generator, subtracting means for subtracting one from the other the loaded voltages generated by said first and second generator of voltage.
A voltage generator outputting a reference voltage with a selected thermal drift comprising:
- a first voltage generator with a thermal drift of approximately zero so that the output voltage of said first generator is approximately constant with changes in temperature;
- a second voltage generator having a selected thermal drift so that the output voltage of said second generator varies with the temperature in a known manner;
- a first load applied to the voltage of said first voltage generator so as to have an approximately constant current with temperature;
- a second load applied to the voltage of said second voltage generator so as to have a varying current with temperature;
- and
- a voltage divider circuit including said first load and said second load coupled to an output node to output a reference voltage at the node between said first and second loads having a desired thermal drift.
Dependencies are inferred from the claim text.