Appeal No. 1997-2034
Application No. 08/347,788
the reference voltage being the difference between the
threshold voltages of the two transistors. Claim 1 is
illustrative of the claimed invention, and it reads as
follows:
1. A circuit comprising:
a first diode-connected natural field effect transistor
connected, in series with a load element, between first and
second power supply connections; said first transistor and
said load element having an intermediate node therebetween;
a second diode-connected natural field effect transistor
connected between said intermediate node and an output node;
wherein said first and second transistors are of opposite
conductivity types, and said first transistor has a threshold
voltage whose absolute value is more than the absolute value
of the threshold voltage of said second transistor;
whereby said output terminal provides a voltage which is
equal to the threshold voltage of said first transistor
reduced by the absolute value of the threshold voltage of said
second transistor.
The prior art references of record relied upon by the
examiner in rejecting the appealed claims are:
Lee et al. (Lee) 3,805,095 Apr. 16,
1974
Yoshida et al. (Yoshida) 4,000,429 Dec.
28, 1976
Numata et al. (Numata) 4,096,382 Jun. 20,
1978
2
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