3 2R 2R 2R 2R 2R 2R R REF REF REF 3 REF 2R 4 REF 4R REF R REF REF REF 8R 016B16R odo+ld+l2d2+l3d3 81+d2+d3)-k 4 R U RB. 2' REF(d123+d222+dh121+do·2) R R R R 2(a323+d222+d121+do·2°) REFE FF第8章 数模转换器和模数转换器 R V I I R V I I R V I I R V I I REF REF REF REF REF REF REF REF 16 16 1 8 8 1 4 4 1 2 2 1 1 0 3 2 = = = = = = = = R V I REF REF = ( 2 2 2 2 ) 2 ) 2 1 4 1 8 1 16 1 ( 0 0 1 1 2 2 3 4 3 0 1 2 3 0 0 1 1 2 2 3 3 =  +  +  +  = + + + = + + + d d d d R V R V d d d d i I d I d I d I d REF REF ( 2 2 2 2 ) 2 0 0 1 1 2 2 3 o 4 3 = − = − = − d  + d  + d  + d  R V R u R i R i REF F F F F  − = = − 1 0 2 2 n i i n i R B U U R R R R 2R 2R 2R 2R 2R 2R I 2 n I 2 n－ 1 I 8 I 4 I 2 S0 Sn－ 3 B0 B1 Bn－ 3 Bn－ 2 Bn－ 1 ＋ － ∞ △ A U Rf S1 … Sn－ 2 Sn－ 1 UR …