Patent ID: 7852061

Claim:
A band gap voltage generator, comprising: a PTAT generator providing an output voltage signal; a transistor for providing a PTAT current, the base of the transistor connected to receive the output voltage signal; and a resistor ladder including a plurality of resistors connected to receive the PTAT current from the transistor and provide a band gap output voltage; a temperature invariant current correction circuit for adjusting the output voltage without altering temperature characteristics of the band gap current, wherein the temperature invariant current correction circuit further comprises: a first group of transistors for controlling an amount of current injected into a first resistor of the resistor ladder ; a second group of transistors for controlling an amount of current taken from the first resistor of the resistor ladder; and wherein the current injected into the first resistor and the current taken from the first resistor are controlled to adjust the output voltage of the band gap voltage generator.