An electronic circuit for providing a voltage or a current linearly dependent on temperature within a temperature range, including at least two identical MOS transistors conducting the same drain current, each transistor having a fully depleted channel which is separated from a doped semiconductor region by an insulating layer, the conductive types of the dopants of said doped semiconductor regions being different, said voltage or said current being proportional to the difference between the gate-source/drain voltages of the two transistors.