Voltage detector having improved characteristics

Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...

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Details

323274, 323284, 327 62, G05F 316

Patent

active

060377623

ABSTRACT:
The present invention includes a circuit for detecting voltage levels in an integrated circuit including a first reference voltage(324), a first differential amplifier(349) having an inverting input terminal connected to the first reference voltage, a non-inverting input terminal and an output terminal, a first transistor (356) having a control terminal connected to the output terminal of the first differential amplifier, having a first current handling terminal connected to a voltage supply terminal and having a second current handling terminal connected to the non-inverting input terminal of the first differential amplifier, a first load (358) device having a first terminal connected to the second current handling terminal of the first transistor and a second terminal, a second load device (360) having a first terminal connected to the second of the first load device and a second terminal connected to a second reference potential, a second differential amplifier (391) having an inverting input terminal, a non-inverting input terminal in connected to the first terminal of the second load device and having an output terminal, the output terminal providing voltage detection output signal, a second transistor (382) having a control terminal connected to the output terminal of the first differential amplifier, having a first current handling terminal connected to the voltage supply terminal and having a second current handling terminal connected to the inverting input terminal of the second differential amplifier, a third load device (386, 384) having a first terminal connected to the inverting input terminal of the second differential amplifier and having a second terminal connected to the point at which a voltage level is to be detected. This provides a highly stable voltage detection system.

REFERENCES:
patent: 3641422 (1972-02-01), Farnsworth et al.
patent: 4714877 (1987-12-01), Kong
patent: 4731574 (1988-03-01), Melbert
patent: 4808905 (1989-02-01), Chen et al.
patent: 5077518 (1991-12-01), Han
patent: 5747974 (1998-05-01), Jeon
patent: 5801552 (1998-09-01), Moore
patent: 5814980 (1998-09-01), Lewis

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