Patent ID: 8575998

Claim:
A voltage reference circuit with temperature compensation, comprising: a power supply; a reference voltage supply; a first PMOS transistor with a source connected to the power supply; a second PMOS transistor with a source connected to the power supply and a gate and a drain connected together to the gate of the first PMOS; a first NMOS transistor with a gate and a drain connected together to the drain of the first PMOS transistor; a second NMOS transistor with a drain connected to the drain of the second PMOS transistor and a gate connected together with the gate of the first NMOS transistor to the reference voltage supply; a resistor connected to the source of the second NMOS transistor and ground; and an op-amp having one inverting input, one non-inverting input, and an op-amp output, wherein the op-amp inverting input and the op-amp output are connected together to the source of the first NMOS transistor, and the op-amp non-inverting input is connected to the ground.