Patent ID: 6930538

Claim:
A bandgap electrical reference voltage source ( 104 ) comprising: a first electrical current source (PTAT 101 ) adapted to produce a first current ( 14 ) proportional to a temperature within an operating range of the source; and a second electrical current source (CPTAT 102 ) adapted to produce a second current ( 15 ) inversely proportional to the temperature; characterised in that the first and second current sources are installed in parallel, and in that the voltage source comprises means (R 3 ) of summating the first and second currents producing a reference current in the summation means generating the reference voltage (VREF) at the terminals of the summation means; wherein the first current source comprises: first current generation means adapted to produce at least one third current (I 1 , I 2 ) proportional to the temperature; and a first current mirror adapted to produce the first current (I 4 ) as a function of the at least one third current (I 1 , I 2 ); and wherein the first current generation means comprises: at least one first operational amplifier (A 1 ) and at least one transistor (M 1 , M 2 ) adapted to produce the at least one third current; at least one bias resistance (R 1 ) adapted to adjust the amplitude of the at least one third current; and at least two bipole transistors (Q 1 , Q 2 ) coupled together such that the voltages between the base and the emitter of the transistors are related through an equation of the diode junction type dependent on the temperature.