Appeal No. 95-4154
Application 08/122,193
re Spada, 911 F.2d 705, 708, 15 USPQ2d 1655, 1657 (Fed. Cir.
1990); RCA Corp. v. Applied Digital Data Sys., Inc., 730 F.2d
1440, 1444, 221 USPQ 385, 388 (Fed. Cir. 1984).
Each of independent claims 30, 38 and 43 specifically
provides for user selection of "predetermined discrete, output
impedances" of the integrated circuit by either controlling or
inputting a select input or impedance selection input to an input
pin of the circuit. We agree with the appellants that Asano does
not disclose user selection of "predetermined discrete, output
impedances" of the integrated circuit.
The examiner relies on the input A and resistor 22 shown in
Asano’s Figure 2 as an impedance selection input (answer at 3,
lines 9-13). However, as is described in Asano from column 3,
line 57, to column 4, line 32, the user selection of a value for
resistor 22 and a value for input A only causes the plurality of
output transistors 1-5 to be selectively turned on or off during
operations over the whole range of the drain current of the
monitoring transistor 20. In column 4, lines 24-32, Asano
states:
As a result, the output resistor of the output circuit
can be rendered to match the characteristic impedance
of the transmission line by controlling the gate width
of the output transistors turned on in accordance with
the magnitude of the drain current within the control
range of the element production variations. The
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