Appeal No. 95-3798
Application 08/063,968
The appellant has stated (Br. at 5) that claims 1-7 stand or fall
together and claims 8-16 stand or fall together.
The Invention
The invention is directed to a circuit which may be used as
a comparator. It includes a differential input stage having a
pair of transistors arranged in differential mode and a pair of
transistors arranged in current mirror mode. It also includes a
hysteresis stage which has a conductance path coupled in parallel
to the conductance path of one of the current mirror transistors
and which is responsive to the conductance state of one of the
differential mode transistors for enabling current through the
hysteresis stage.
Claims 1 and 8 are independent claims. All other claims are
dependent claims. Claim 1 reads as follows:
In combination:
a first pair of transistors configured in a
differential mode;
means for providing constant current into the
conductance paths of said pair of differential
transistors;
a second pair of transistors configured in a current
mirror mode, the conductance paths of said current
mirror transistors individually coupled to the
conductance paths of said differential mode
transistors;
an hysteresis stage having a conductance path
-3-
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