Appeal No. 20000-0717
Application 08/906,676
However, since Rogers is not concerned with high
frequency signal sources or VHF synthesizers or a high
frequency synthesizer, as is the instant invention, where the
use of dividers for generating signals from a single VCO
presents a noise problem, Rogers would appear to have had no
need for the dividers and low pass filters which the examiner
so cavalierly proclaims would have been a “design expedient.”
If Rogers suggested that the source signal frequency needed to
be reduced or if Rogers suggested, or indicated, in any
manner, that there was a need for filtering the output of the
phase comparator 32 or that there was a problem with noise
regarding the signal output by the phase comparator, then we
would agree with the examiner that the skilled artisan would
have known to employ a divider and/or a low pass filter,
respectively, at the appropriate points in the circuit to
alleviate these problems. But, in fact, Rogers does not
indicate that there is a problem with high frequencies at the
source input or that there is a noise problem with the signal
output from the phase comparator. In fact, appellant has
argued that because Rogers teaches the use of a real-time
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