Patent ID: 8648648

Claim:
A bandgap voltage reference circuit, comprising: a current generation stage configured to generate a proportional to absolute temperature (PTAT) current and a complementary to absolute temperature (CTAT) current and to generate a reference current by combining the PTAT and CTAT currents, the current generation stage including a plurality of components having corresponding component parameters that affect a curvature of a bandgap voltage reference; an output stage coupled to the current generation stage and configured to combine the PTAT current and the CTAT current to generate the bandgap voltage reference; and a curvature correction circuit configured to generate a curvature correction current that mirrors the reference current generated from the PTAT and CTAT currents, the curvature correction current having a ratio relative to the reference current given by a variable current ratio parameter, the variable current ratio parameter being adjusted to a value that provides a desired curvature of the bandgap voltage reference without adjusting the values of any of the component parameters in the current generation stage.