Patent ID: 6037762
Filing Date: 2000-03-14
Classification: G05F

Abstract:
A circuit for detecting voltage levels in an integrated circuit comprising,A first reference voltage;A first differential amplifier having an inverting input terminal connected to said first reference voltage, a non-inverting input terminal and an output terminal;A first transistor having a control terminal connected to said output terminal of said first differential amplifier, having a first current handling terminal connected to a voltage supply terminal and having a second current handling terminal connected to said non-inverting input terminal of said first differential amplifier;A first load device having a first terminal connected to said second current handling terminal of said first transistor and a second terminal;A second load device having a first terminal connected to said second of said first load device and a second terminal connected to a second reference potential;A second differential amplifier having an inverting input terminal, a non-inverting input terminal connected to said first terminal of said second load device and having an output terminal, said output terminal providing voltage detection output signal;A second transistor having a control terminal connected to said output terminal of said first differential amplifier, having a first current handling terminal connected to said voltage supply terminal and having a second current handling terminal connected to said inverting input terminal of said second differential amplifier; andA third load device having a first terminal connected to said inverting input terminal of said second differential amplifier and having a second terminal connected to the point at which a voltage level is to be detected.