CMOS voltage reference

Claim 1

Circuit configuration in complementary MOS technology for generating a reference voltage independent of temperature with the aid of a bandgap circuit, comprising first and second bipolar transistors having output circuits, respective first and second base-to-emitter threshold voltages and interconnected base connections, a first resistor being connected to said first bipolar transistor and defining a first connecting point therebetween, second and third series-connected resistors defining a second connecting point therebetween, first and second field effect transistors having output circuits and drain connections, a supply voltage source having terminals, a first series circuit including said output circuit of said first bipolar transistor, said first resistor, and said output circuit of said first field effect transistor being connected between said terminals of said supply voltage source, a second series circuit parallel to said first series circuit including said output circuit of said second bipolar transistor, said series-connected second and third resistors, and said output circuit of said second field effect transistor, an operational amplifier having inputs connected to said first and second connecting points and an output controlling said field effect transistors, and a bandgap circuit having an output at said drain connection of said second field effect transistor being fed back to said base connections of said bipolar transistors.