Appeal No. 95-4154
Application 08/122,193
control circuit 25 may be configured the same way as
the control circuit 24 but with different polarities of
the control signal 27.
The appellants correctly assert (Br. at 5, lines 31-33) that
in Asano, the selection of the input A merely calibrates the
range of control values to correspond to the full range of the
drain current of the monitoring transistor 20. Precisely what
output impedance the circuit will have depends on the detected
drain current during operation. The appellants are correct that
such functionality of Asano does not allow the user to "select
predetermined discrete, output impedances of the circuit" (Br. at
5, lines 23-25). The objective of Asano is to automatically
match the output resistance of the circuit with the impedance of
the transmission line (column 2, lines 43-45), not to have user
selection of predetermined discrete, output impedances.
We decline to read the claim language on user selection of
"predetermined discrete, output impedances of the circuit" so
broad as to cover the case of having a number of possible
impedance values based on another parameter over which the user
does not control, i.e., the drain current of Asano’s monitoring
transistor 20. In the context of the appellants’ specification,
"select" means choosing a particular value or setting. The
language of selecting predetermined discrete output impedances
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