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1、l:2005-12-01; : 2006-03-31Ba2-$A/ DFIR3ro李 梁, 李儒章, 张俊安, 杨毓军(ESELi;S0S/v=E,i 400060)K 1: 讨论了一种用于2-$ A/D转换器的固定系数半带( half-band) FIR数字滤波器,分析了其线性相位特性和低通滤波特性,给出了频率仿真结果,以及在Cadence设计系统中的电路和版图实现b1oM: A/D转换器; 过采样; 半带; 有限冲激响应; 数字滤波器; 线性相位; 低通滤波ms|: TN713+ .7 DSM: A cI|:1004-3365(2006) 03-0340-04An FIR Digtal F
2、ilter for Sigma-Delta A/ D ConverterLI Liang, LI Ru-zhang, ZHANG Jun-an, YANG Yu-jun( National L abora tory of A nalog I nte gr ate d Cir cuits; Sichu an Institute of S olid-S tate Circu its, CET C, Chongqing 400060, P . R. China)Abstract: A half-band FIR digital filter with fixed coefficient for si
3、gma-delta A/ D converter is discussed. Thelinear phaseand lowpass filtering characteristics of the circuit are analyzed. The circuit and layout design based onCadence design system is described. The circuit is simulated and results are given.Key words: A/D converter; Oversampling; Half-band; FIR; Di
4、gital filter; Linear phase; Lowpass filterEEACC: 1270F1 引 言Ppv,8f/r.2,i16sOqbN,8In?aay-4/,!9)FIR3rob3632006M60MicroelectronicsVol1 36, l 3Jun120062 半带FIR数字滤波器的特性2-$ A/Do.Z,t1p.|bTBHWd+1,5M+/LM:arg H ( ejw ) = - kwT, k,5|x ( n)YVd,y ( n)q+:Y( ejw )= H ( ejw ) X ( ejw ) =e- jkw | X ( ejw )| ej arg X (
5、 ejw ) =| X ( ejw )| ej arg X ( ejw ) - j kwy( n)= x ( n- k)V,LMdy ( n)HW,7ob!9FIR3roro/+:H ( n)= H ( M- n) n= 0, 2, 4, , MH ( n)= 0 n= 1, 3, 5, , M- 1 nXM/ 2T, M,53roVrT:y( n)= EMn= 0H ( n) x ( n)= H (M2 ) x (M2 ) +EM2- 1n= 0H ( n) x ( n)+ x ( n- M) T, n= 0, 2, 4, , M2 - 1,Ba=a)3ro, MsY22a42106bH (
6、 ejw )= EMn= 0H ( n) e- jnw = EM2- 1n= 0H ( n) e- jow +EMn= M2 + 1H ( n) e- jnw + H ( M2 ) e- jM2 ww,H ( ejw )= e- jM2 w 2 EM2- 1n= 0H ( n)cosM- n2 w + H (M2 ) T, n= 0, 2, 4, , M2 - 1bVA, H ( ejw )LM,arg H ( ejw ) = - M2 wiO,YYro+b3 半带FIR 数字滤波器结构YV-s,A,FIR3roYro+LM+,iOroB0,vemLCbm1B)FIR3rombVmVA,FIR
7、3roB0,6B1KWb,B)23FIR3ro17ro,V7vvemLCbV)(?,rosYM,MF,K3robm1,(?TVq,YV|,3roVqB,V)FIR3ro,qVq1/8,iO9F16bm1 B)FIR3rom4 半带FIR 数字滤波器的频率响应ro,2-$ A/Dro?S1p(,h1r80 dB,Yol0.004 dB),YV!9,robm2m5sYB)FIR3roYMYbVmVA,LM,h80 dB,Y,Yzv0.5q),7Oro3 :Ba2-$ A/DFIR3ro341 9F,VN,bm2 B)FIR3roYm3 B)FIR3roMYm4 )FIR3roYm5 )FIR3ro
8、MY5 半带 FIR 数字滤波器的电路设计和仿真3roL=(?aFEEb2-$ A/D,13roSA/D=,iO3roX%,8,S=,iOMFE9E,Lvv4,mLC4b(?MHeD(?,m6Ubm6 MHeD(?FS F,m7Ubm7 Ft(?FT$,3robLC3roETH,roX!9z,yN,MMFZE,eELC,vv8bB)FIR3romm8Ubm8 B)FIR3romCadence!9d,0. 35 LmSCMOSPDK,!9)FIR3ro,i_bm9ro?_mb342 :Ba2-$ A/ DFIR3ro2006M m9 FIRY3ror.2_m6 半带FIR数字滤波器版图设计0. 35 LmSCMOSPDKmPcell,m,8In?f/,m!9bm10B)FIR3robm10 B)FIR3rom7 结 论)B2-$ A/DFIR3ro,sLM+Yro+,rom,#Ca-dence!9dmaro?_m0.35 LmSCMOSmbFIR3ro!9V2-$ A/D%3
