Appeal No. 95-0020
Application No. 08/052,213
The invention is directed to a CMOS buffer with a controlled
slew rate. By optimally controlling the rate of transition from
a high/low state to a low/high state at the output, reduction of
signal line reflection and ringing at the output and in the cable
or connectors coupled to the output is said to be enabled.
Independent claim 42 is reproduced as follows:
42. A method of controlling slew rate on an output terminal,
comprising the steps of:
activating an output transistor;
comparing a voltage on the output terminal to an internal
node voltage during output transistor activation; and
modulating the rate of a voltage transition at the output
terminal in response to the comparison of the output terminal to
the internal node voltage.
The examiner relies on the following reference:
Bianchi 5,122,690 Jun. 16, 1992
(filed Oct. 16, 1990)
Claims 42 through 44 and 46 stand rejected under 35 U.S.C.
' 102(e) as anticipated by Bianchi.
Reference is made to the brief and answer for the respective
positions of appellant and the examiner.
OPINION
In accordance with appellant’s statement at page 3 of the
brief, claims 42 through 44 and 46 stand or fall together.
Accordingly, we will base our decision on an analysis of
independent claim 42.
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