Appeal No. 2006-1816
Application No. 10/386,146
determination regarding the obviousness of the claimed subject
matter has occurred. Ko describes a multiplexor circuit
including the transmission gates and differential inputs and
outputs. See Figures 4-6. Graves on the other hand teaches a
low-voltage bus switch that prevents leakage during the power
loss and thus maintains the isolation of the bus (col. 2, lines
5-15). Although Graves does not mention a multiplexor structure,
the disclosed switch pertains to isolation of circuitry and
preventing leakage which is missing in Ko. Graves further
discloses the complementary pass transistors MN1 and MP1 and
diode D7 as the first blocking element between the back-gate of
the first pass transistor MP1 and a power supply (col. 3, lines
47-55). Although the Examiner considers both blocking elements
as the blocking diode D0 connected to the power supply, Graves
clearly shows the claimed second blocking element as the blocking
transistor MP3 which is coupled between a gate node of the first
pass transistor MP1 and a respective signal path such as that of
the input terminal B for preventing a current leakage from the
input terminal through the first pass transistor to the output
(col. 3, lines 8-22).
7
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