Appeal No. 1997-2844
Application No. 08/242,881
output. The comparator is provided with an input voltage and
with a threshold voltage equal to the output of a voltage
dividing circuit. A switching circuit is set to an ON
condition when a constant current output from a constant
current circuit is provided to the voltage dividing circuit
and set to an OFF condition when the
constant current is not provided to the voltage dividing
circuit. Claim 1 is illustrative of the claimed invention,
and it reads as follows:
1. A hysteresis circuit comprising:
a voltage dividing circuit which outputs a voltage
resulting from a division of a reference voltage by resistors;
a comparator is provided with a) said output voltage
of the voltage dividing circuit as a threshold voltage and b)
an input voltage;
a constant current circuit which converts a
temperature-compensated reference voltage into a current using
a resistor; and
a switching circuit being ON and OFF controlled
according to an output of the comparator, said switching
circuit being set to an ON condition where a constant current
output from the constant current circuit is provided to the
voltage dividing circuit and being set to an OFF condition
where the constant current is not provided to the voltage
dividing circuit,
wherein an output voltage of the voltage dividing
circuit differs between when the constant current is provided
2
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