Appeal No. 1999-0395
Application No. 08/515,900
microprocessor 28, and it is described in Garner at column 7,
lines 40 through 45, column 8, lines 47 through 55, column 13,
lines 14 through 25, column 14, lines 11 through 14, and
column 15, lines 37 through 44. The oscillation frequency of
the reference clock generated by oscillator 30 in Garner is
switched in accordance with a state of output SEL from
microprocessor 28. The only difference between Figure 2 of
Garner and claim 1 is that Garner does not use a variable
capacitance diode in the oscillator 30. Thus, it appears that
the clock oscillator circuit, frequency switching circuit, and
control circuit teachings of admitted prior art Figure 8 are
merely cumulative to the teachings found in Garner.
For a teaching of the use of a variable capacitance diode
66 in a clock oscillator circuit, the examiner turns to the
teachings of Smith (Figure 1; column 5, line 60 through column
6, line 33). In view of Smith’s teaching that it is well
known in the art to use a variable capacitance diode in a
clock oscillation circuit, we agree with the examiner that it
would have been obvious to one of ordinary skill in the art to
use such a circuit component in the oscillator disclosed by
Garner.
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