Patent ID: 6472912
Filing Date: 2002-10-29
Classification: H03K

Abstract:
A circuit for monitoring the level of a voltage comprising:a first circuit for producing a current which varies in response to the level of said voltage, said first circuit comprising: a first resistor coupled to said voltage; a first transistor coupled to said resistor; a second transistor with its gate coupled to the gate of said first transistor; a second circuit coupled to said first circuit and for producing a current which varies in response to the level of said voltage, said first and second circuits having different responses to said voltage, said second circuit comprising: a second resistor coupled to said voltage; a third transistor coupled to said resistor; a fourth transistor with its gate coupled to the gate of said third transistor, wherein said first, second, third, and fourth transistors have different widths; said circuit having an output taken from said second transistor operable to go between two modes in response to the level of said voltage.