Patent ID: 9639133
Date: 2017-05-02
CPC Classifications: G05F,G06F

Claim:
1. An apparatus comprising: an input for providing a first voltage signal; a level translator, coupled to the input, to translate the first voltage signal to a second input voltage, the second input voltage having a voltage level higher than a voltage level of the first voltage signal; and an open loop reference core coupled to the level translator, the open loop reference core to receive the second input voltage and to generate an output indicating whether the first voltage signal is above or below a reference level, wherein the open loop reference core is a bandgap reference circuit comprising a comparator with offset cancellation, the bandgap reference circuit configured in an open loop configuration without the output of the comparator being fed back to the second input voltage, and the comparator with offset cancellation comprises a first differential switch which is operable to directly connect or cross couple a differential input as a first differential output.