Appeal 2007-1293
Application 10/745,124
INVENTION
The invention is directed to a circuit to mask single event transients in a
comparator. The circuit includes an R-C low pass filter in series with a Schmitt-
trigger. The circuit is connected to the output of a comparator. See page 2 of
Appellant’s Specification. Claim 1 is representative of the invention and
reproduced below:
1. A circuit comprising:
a comparator having two inputs and a comparator output;
an RC delay circuit coupled to the comparator output;
a feedback resistor coupled between the comparator output and one of
the inputs; and
a logic device coupled to an output of the RC delay circuit to provide
a logic device output having clean edges, wherein the RC delay circuit has
an RC time constant sufficient to prevent single event transients from
adversely affecting the logic device output.
REFERENCES
The references relied upon by the Examiner are:
Nishibe US 5,592,112 Jan. 7, 1997
Yanagihara1 JP 410022783 A Jan. 23, 1998
Lieder US 2003/0043998 A1 Mar. 6, 2003
(filed Nov. 28, 2001)
Konopka US 6,727,662 B2 Apr. 27, 2004
(filed Sep. 28, 2002)
1 The Examiner and Appellant refer to this reference as Yanagihara.
2
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