Miscellaneous active electrical nonlinear devices – circuits – and – External effect – Temperature
Patent
1998-04-10
1999-10-05
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
External effect
Temperature
327205, 327 83, 327 74, H01L 3500, H03K 3037
Patent
active
059630795
ABSTRACT:
A logic circuit for providing hysteresis in the sensing of the temperature of an integrated circuit includes two voltage comparators and a D-type flip-flop. Each of the comparators compares a reference voltage and a respective one of two voltage signals which represent and vary in respective relations to the temperature of the integrated circuit. The resulting binary output signals of the comparators are asserted and de-asserted at different approximate temperatures, i.e., with one being higher and the other being lower with respect to one another. One comparator output signal serves as both the input data signal and output clear control signal for the flip-flop while the other serves as the clock signal. Accordingly, the output signal of the flip-flop is asserted during a time which follows an increase in the measured temperature above the higher approximate temperature value and precedes a decrease in the measured temperature below the lower approximate temperature value.
REFERENCES:
patent: 4546238 (1985-10-01), Ahs
patent: 4851954 (1989-07-01), Surig
patent: 5278796 (1994-01-01), Tillinghast et al.
patent: 5455510 (1995-10-01), Nelson
patent: 5603220 (1997-02-01), Seaman
National Semiconductor Corporation
Tran Toan
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