Circuit for amplifying a signal representing a variation in resistance of a variable resistance and corresponding sensor

A circuit for amplifying a signal representing a variation in resistance of a variable resistor sensitive to a physical quantity to be measured comprising:

• at least a first load connected to an output terminal of a first transistor, an input terminal of the first transistor being connected directly to a reference resistor, and
• a second transistor having an input terminal connected directly to the variable resistor and an output terminal connected to a second load,
• wherein the circuit is capable of recovering an amplified signal at the terminals of the first load, and wherein
• a control electrode of the first transistor is connected directly to both the control electrode and to the output electrode of the second transistor,
• the first load comprises a third transistor comprising an output electrode connected to the output electrode of the first transistor,
• the second load comprises a fourth transistor comprising an output electrode connected to the output electrode of the second transistor,
• a control electrode of the third transistor is connected directly to both a control electrode and to an output electrode of the fourth transistor, and
• an input electrode, respectively an output electrode, corresponding either to a source electrode, respectively a drain electrode, of a corresponding transistor for a metal oxide semiconductor (MOS) field effect transistor, or to an emitter electrode, respectively a collector electrode, of the corresponding transistor for a bipolar transistor.