Power-on-reset circuit having a differential comparator with int

Details Power-on-reset circuit having a differential comparator with int Power-on-reset circuit having a differential comparator with int

1985-09-23

1987-01-06

Anagnos, Larry N.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307200B, 307354, 307362, 307597, H03K 5153, H03K 524, H03K 17687

Patent

active

046349057

ABSTRACT:
A power-on-reset circuit which functions with variations in process, temperature and supply voltage is provided. A differential comparator structure is provided which utilizes a differential pair of transistors and which has a substantially constant intrinsic offset voltage associated therewith. The intrinsic offset voltage is created by making one of the transistors of the differential pair of lightly doped depletion device and the other transistor a heavily doped depletion device. A second reference voltage is provided in response to a detected power-up voltage and is implemented with a voltage divider. Power-on-reset is provided in response to the relationship of the levels of the first and second reference voltages.

REFERENCES:
patent: 4260907 (1981-04-01), Winebarger
patent: 4296338 (1981-10-01), Thomas
patent: 4367423 (1983-01-01), Hornung
patent: 4428020 (1984-01-01), Blanchard, Jr.
patent: 4466074 (1974-08-01), Jindrick et al.
patent: 4473759 (1984-09-01), Mahabadi

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