Patent ID: 6992489
Filing Date: 2006-01-31
Classification: G01R

Abstract:
1. A detection circuit configurable for comparing a first voltage supply with at least a second voltage supply applied to the circuit and for indicating a voltage level of the second voltage supply, the detection circuit comprising: at least one transistor, the at least one transistor including a first bias terminal connecting to the first voltage supply, a control terminal for receiving the second voltage supply, and a second bias terminal operatively coupled to an output of the circuit; and a passive load connected between the second bias terminal of the at least one transistor and a third voltage supply; wherein the detection circuit is configured to generate an output signal at the output of the circuit, the output signal being at a first logic value indicating that the second voltage supply is substantially at a first voltage level, and the output signal being at a second logic value indicating that the second voltage supply is substantially at a second voltage level, the first and second voltage levels defining an operating voltage range of the second voltage supply; wherein when the second voltage supply is at one of the first and second levels, the detection circuit draws substantially no current.