Appeal No. 97-0951
Application 08/148,452
compare Appellants' figure 2 with figure 4 in Wong. The
claimed "pair of inverter circuits" corresponds to elements
58 and 59 in Appellants' figure 2. Presumably, the Examiner
reads the "pair of inverter circuits" on inverters A and B
in Wong because a capacitance must be charged and discharged
through the inverter and the only capacitance shown in Wong
is at the output node V . Under this interpretation, we do
0
not find "an output current switch comprising a pair of
switching transistors" corresponding to DAC current switch
49 with switching transistors 53 and 55 in Appellants'
figure 2.
If the Examiner reads the "pair of inverter circuits"
on inverters C and D in Wong and the "output current switch
comprising a pair of switching transistors" on the
inverter B having a pair of transistors Q1B and Q2B, then we
find that the circuit fails to operate to charge and
discharge a capacitance on the node between inverter C and
transistor Q1B or on the node between inverter D and
transistor Q2B; no capacitance is shown at these nodes. If
the Examiner is relying on some other interpretation of the
claims, it should be expressly stated.
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