Patent ID: 8536854

Claim:
An apparatus comprising: a bandgap reference circuit to generate one or more bandgap reference signals that are substantially invariant to at least changes in direct current values of a supply voltage of the bandgap reference circuit; a current mirror, coupled to the bandgap reference circuit, to receive and mirror a control signal, wherein the control signal controls the one or more bandgap reference signals generated by the bandgap reference circuit; and a proportional to absolute temperature reference signal generator coupled between the bandgap reference circuit and the current mirror to generate one or more proportional to absolute temperature currents from at least one of the bandgap reference signals, wherein the one or more proportional to absolute temperature currents are substantially invariant to at least changes in direct current values of the supply voltage of the bandgap reference circuit, and, during operation of the current mirror, bulk error currents exist in the current mirror and each proportional to absolute temperature current is substantially invariant to the bulk error currents in the current mirror.