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| Introduction !! !! " # " ! ! $ " %! & ' $ ! " (%!! ! % ) ! )* " !! % +! $ ) " ! # ! # !! +! ! , (! " * !) ! ! +# ) ! ! (! -* ! +! !! ) ) ! ! ! %" +! # . /# ) ! +! $ ! " ! ( * ! ! ) ! +! % ) % Example I (See Figure 1.) +! ! $ 0 12- # % % ! 3 12- +! ) 3 12- ) 4 ! ! % Figure 1. +! , ! ! # ! ) (0 12-*# # ) % # ! 3 12- +! " Example II (see Figure 2.) +! ! $ 0 12- # % ! 53 12- +! ) 3 12- ) 4 ! ! % Figure 2. +! , ! ! # ! % ! ! ) (0 12-*# ! ! # ) # ! 53 12- +! !! (! ) * Results ) ! $ Graph 1. 6 ! ! - ! # %!! ! 6 ! ) ! " +! ) ) ! $ ! " ! ! +! ) ! Conclusion +! ! $" ) ) %! ! 7 ! % ! ! ! 7 " " ! ! +! ) - ! $ !! ! " +! ) - ! " % 8 DOUT (s)/DIN (s)=(1*exp(*N*s/F S ))/(N(1*exp(*s/F S ))) %!# &9 ( * 9 ( * # ,9 & +! ) ! ) " +! "&" XRDAN28 XRDAN28 " 7,(* 0 12& 0 12 : : 3 12& ;+ Equivalent Systems e 7,( * *S 30MHz : : ;+(&* ;+(&*< 3 12- D OUT (S) = A IN (S) 1 * (1 + e 2 *S 30 MHz) Figure 1. Two Samples Averaged "0 " " 0 12& : : 7,(* : : = 53 12& ;+ 0 12- Equivalent Systems e 7,( * * 3* S 30MHz * 2* S 30MHz *S 30MHz e e : : : : = ;+(&* ;+(&*< 53 12- D OUT (S) = A IN (S) 1 * (1 + e 4 *S 30 MHz +e * 2* S 30 MHz + e 30 MHz ) * 3* S Figure 2. Four Samples Averaged XRDAN28 A/D SAMPLE RATE*30 MHz & ? = & @53 12@3 12- A (;+ 7,* > = 12DOUT2 12DOUT4 12- 012- =12- 312- >12- Graph 1. Decimation Filter Frequency Response 0 XRDAN28 Notes = |
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