Voltage reference circuit

A voltage reference circuit comprising:

• a first branch comprising:
• a first depletion-mode top transistor, the drain of which is connected to a voltage source,
• a first enhancement-mode bottom transistor, the source of which is connected to the ground, the drain of which is connected, on the one hand, to the gate of the top transistor, and on the other hand, the gate of said bottom transistor, and
• a dipole, a first terminal of which is connected to the source of the top transistor and the second terminal of which is connected to the drain of the first bottom transistor, and
• a second branch comprising:
• a second depletion-mode top transistor, the drain of which is connected to the voltage source, the source of which is connected to the drain of a third depletion-mode transistor, and the gate of which is connected to the source of said third depletion-mode transistor, and
• a second enhancement-mode bottom transistor, the source of which is connected to the ground, and the drain of which is connected to the source of the third depletion-mode transistor,
• the source of the first top transistor of the first branch being connected to the gate of the third depletion-mode transistor of the second branch, the gates of the first bottom transistor of the first branch and of the second bottom transistor of the second branch being connected so as to form a current mirror, the reference voltage being provided to the source of the second top transistor of the second branch.