Precision hysteresis circuit

Details Precision hysteresis circuit Precision hysteresis circuit

1990-10-29

1992-06-16

Mottola, Steven

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307362, H03K 5153

Patent

active

051226804

ABSTRACT:
Described is a CMOS circuit arrangement with precise balanced, differential switch points. The circuit arrangement includes a voltage-follower which forces a reference voltage across an on-chip reference resistor. The current which is generated is mirrored and is made to flow through a plurality of on-chip resistors. The mirrored current flowing through the plurality of resistors generate a plurality of proportional reference voltages. Two of the proportional reference voltages are used to set the switching threshold to one input of a comparator whose output is fed back to control a switch which selects one of the two voltages. Another one of the proportional reference voltages is coupled to another input of the comparator. The circuit arrangement forms a hysteresis circuit if positive and negative thresholds are chosen.

REFERENCES:
patent: 4004158 (1977-01-01), Morgan
patent: 4733107 (1988-03-01), O'Shaughnessy et al.

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