Appeal No. 98-0130 Page 8
Application No. 08/631,793
components to demodulate amplitude modulated carrier signal.”
Snow’s invention (col. 1, line 50 col. 2, line 9) provides for
a regulator for a power supply which reduced the number of
components and manufacturing costs by utilizing pulse position
modulation to directly control the duty cycle of the switch
drive signal.
The mere fact that Snow discloses that it was known to
modulate a carrier signal with feedback information, merely
establishes that modulation of a carrier signal is within the
scope and content of the prior art. This does not, in and of
itself, establish obviousness. It merely begs the point. To
make the modification advanced by the examiner of replacing
circuitry for pulse position modulation circuitry with
circuitry for modulating a carrier signal, there would need to
have been a suggestion or teaching in the prior art. Snow
specifically teaches away from utilizing carrier modulation to
avoid the additional complex integrated circuit, several
components to demodulate the amplitude modulated carrier
signal (col. 1, lines 41-48) associated with modulating a
carrier. By utilizing pulse position modulation circuitry
instead of amplitude modulating a high frequency carrier
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