Appeal No. 97-2630
Application 08/186,050
design consideration/criteria in the art. Of
course, in order to combine a digital and analog
circuits into a single chip, the designer must
consider standard/well known design guidelines like
the noise or transient/static discharge preventions.
The problems such as the noise and transient/static
discharge are one of the most typical or fundamental
consideration when it comes to design or integrate a
combined digital-analog circuits.
It would have been obvious at the time the
invention was made to one having ordinary skill in
the art to combined the functional circuits of the
Duschatko according to the designer’s choice for the
reasons discussed above. [Emphasis in original.]
The examiner’s reasoning is directed to generalities
rather than the specific features recited in claim 13. For
instance, while silicon control recitifiers may have been well
known, that does not mean it was well known to use them in the
specific arrangement required by appellant’s claim 13. Fujita
teaches separate power supply lines for digital and analog
circuits on an integrated circuit chip, not three separate
power distribution networks, one for analog circuitry, another
one for digital control circuitry, and still another one for
buffers. Also, Hurst’s using silicon controlled rectifiers
between circuit portions 16, 18, and 20, and pins P1-Pn is not
the same as connecting silicon control recitifiers between
separate power distribution networks, where each silicon
12
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