Ex Parte Nash - Page 2

             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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