Patent ID: 7944248
Filing Date: 2011-05-17
Classification: G01R

Abstract:
1. A circuit comprising: a first multiplexer that receives a first supply voltage at a first input and a second supply voltage at a second input, wherein the first multiplexer selects one of the first and the second supply voltages as an internal voltage of the circuit; a comparator that compares the internal voltage of the circuit to a selected reference voltage; a control circuit that receives an output signal of the comparator and generates a select signal; a resistor divider that generates reference voltages; and a second multiplexer that provides one of the reference voltages from the resistor divider to the comparator as the selected reference voltage in response to the select signal, wherein the first supply voltage at the first input of the first multiplexer is not generated based on the output signal of the comparator, and wherein the second supply voltage at the second input of the first multiplexer is not generated based on the output signal of the comparator.