Appeal No. 2003-2072
Application No. 09/735,439
the test signal path. In addition, the transfer switch must
provide a high degree of isolation in all of the terminated
paths. See page 1 of Appellant's specification. Figure 1 is a
schematic drawing of a two port transfer switch 10 according to
Appellant's invention. See page 2 of Appellant's specification.
As shown in Figure 1, switch 10 utilizes a routing switch 11 and
two port termination switches 19 and 29. Routing switch 11
receives test signal input and provides a first and second
output. Routing switch 11 is constructed from two coupled
dividers shown as 15 and 25. Each divider includes two switches
shown at 16 and 17 for divider 15 and 26 and 27 for divider 25.
The switches are coupled such that switches 16 and 26 are in
opposite states with respect to one another, and switches 17 and
27 are also in opposite states with respect to one another.
Thus, one of the outputs is connected to the input and the other
output is connected to ground. See page 3 of Appellant's
specification. Figure 1 further shows that each of the output
terminals of the routing switch 11 is connected to a port
terminal switch 19 and 29. Port terminal switches 19 and 29 each
include a common-base transistor 13 and 23 respectively. See
page 3 of Appellant's specification.
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