Comparator with controlled hysteresis

Details Comparator with controlled hysteresis Comparator with controlled hysteresis

1992-10-13

1994-11-08

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327206, H03K 524

Patent

active

053629949

ABSTRACT:
A hysteresis comparator is disclosed which utilizes an on-chip bias generator, and incorporates circuitry which renders the decision voltages V.sub.P and V.sub.N insensitive to semiconductor process variations, independent of any critical reference voltages, and proportional to absolute temperature. Current sources coupled to positive and negative bias voltages are utilized to generate precise voltages across resistors to set the magnitude of V.sub.P and V.sub.N, which magnitudes are set by the ratios of like components existing within the same integrated circuit. Hysteresis comparators with precise and repeatable decision voltages can be implemented while consuming a minimum amount of semiconductor area.

REFERENCES:
patent: 4536666 (1985-08-01), Metz et al.
patent: 4739189 (1988-04-01), Kellogg
patent: 4894620 (1990-01-01), Nagaraj
patent: 4926068 (1990-05-01), Fujita
patent: 5155388 (1992-10-01), Corcoran et al.

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