模数转换电路.ewb

EWB经典实用列子

0240<H@A@3868I48H<<KHF0?4:<8L=H@<>4JDMHD@B4:<LH9<38F8O05H=HKHB0=D
1@3@208480A0I044B8FHM4I<L<L@94G<M@4DF<@4N<6H?HD8G4CL=@NHJD@@H<5D6
@D4M@2HC@B0><I<IDGHC4>0G08D4HB@KD280<4HL@;@@<F<AL4H3@EHA414=4JLH@
@@C@=<>8@0B014@L=<<888C87D=@88IH5D645<8L8H9@8@JLK09@6<C4G4NHL4H@2
D@@C8M<<H88ILND5L=HH8L478C0<0L0G8C830JL0<OH04$000@2@@000C4H<CD6@>
8I8@0=050F<GDN@K@0<LLID3@20=4>@J00024F<8L<H:L1H2060I4;H><I8C@9D6<
C<6LH<K4203@40<@H09@C4C4<@@D64=LK0G@E44<FLKH>4K44HE@5L=4I0L8G<G0?
48<FH64>0800@0444L8@H90K8DH5LAL<4>H?LC4@014@<M<=8K@K@NDND;0GL>D80
L<4H4@K@4L2<JD?D64<@88I@@4>4C<9@8@NLI4A@E<=0<8@8@HC8;@<088IH4D648
0J0I@2@9DEH6<?DK09L@H1DC0>4009H10G<3L=8685DE<?<68AH8D>DOL=@;DH8<H
8H6@74=088K0>D64<888AD:0<8HH0474<4>0H0A@C4M@@03474842LEH@H20<8K08
@<@H820A@ID281HO00L$000@38500004:81L<<KHF0?4:<8L1HA06@40<0@04@C8K
@944<DLI@BL6@<@N4;DK@G@44K<307040@8@020B48<4@=DJ<BLHLI4B<>HK49<<H
0<LLIDK@58J0840<8@1@C4KD7D6DCL28GDLHB@74C<LH1DH404L8HH9@F85LJ@K@@
82<?8=HKD7D6<24KD<86<=HG4O4F@0DC870;L88ID=D64<088ILNDG<A<4H1@EHH<
1418EHA<146DJLIDK@>D6H>4:4B85@24D<4HHHFH4054BLC8G<DH4HD8=<4<B<306
@@<9L68<0<HBD2<>@14H@LHMHHL>850A8O<=8HH?D68D4M@?H<@:01DO00L$000@L
@B@04J4800410B074M@DDLL3H70=LLH@090D<@<0HA0306L80I@=@0<0H10C0<@EL
74<DIHDHC41D207080K@=@4<<HK8FL484<4L;4<4I@3<6H=LM8I0ED>L;@6H>LJ8B
HG<5L=4I0L8G<G0?48<FH64>0800@0444D8@H90K8DH5LALB<4L;@MHB<;4@H9<;0
9H30;@BLD<LHEHE<=4JLHD@@F0M<<H88IDNDKD4DM04H3@EHALK@>0HH>D6<D4M@7
8C<20><KDI@F0N0IHH@O0;DK@4L6<MHH<14H8=HA4341H8@>L9<1@C0:0>H5DJ@K0
?<JLI01@O@8L><=DK0O@IH>4>LODJ0H@O42@2@L4NDMH3L:@LD@@H<OD>HH09@0@N
L0<OH04$000@HHG@<4N<DHAH3@20=480H000J4800410B0?8G0B<8H9HC45L=4I0L
8G<G0?48<FH64>0800@0444L8@H90K8DH5LALB<4LMDF8BLI@0HIHC<G4:DD0@<0H
A034649LGD=L4HK4=89HC4F<M42D6<?D=@@0B0K4=H?DJH;DIH8L6D=HKH844HDH6
@?@IHD4A4M83@C8:0><=H345H?L6<L<842@0L6LF@<L8H9D90G02D;4=H60D4LHBH
C4>49<9D<@FLJH:L1@C440M@2HC4L4<H8@BL6H580L9HJ0>D14ID20ID9@8@<81H3
<L0H@0@1DBH=HB434O0A4EH5@C4L0E<=@H07L$000@=8@0B004@8HH1@2060806@:
00008D@3HLHB@746<0L8@383D6H80H@00@40<LLB<306@ELA45460LH1DC<6L>DL@
JH6<EHI4CD6@>8I8?@948<2HKLHDID3<F8AD@40<48101024688@J86H?D?4C@7@=
4BLGD<@6H>0KHHHA<<D=D<H7@68D<4HD8M<L<B8306DJ<3HH8=HA8147D6LBLF434
7424KDG@?<80L@@@F8N844M0BHC47D6LB4KD@8F<M0K@0@;DFLBHK4I8C4842<HLI
DJ@5D68<<:<M0G80D4HJ@K@B86<102D2<0H>HD014GHM@B06<M@700@8D8@0@C@4D
6DA0202<3@2028N01L$000@80N@=4D0000@I03@MHD@B4:<0H4@ILNHJ8><1LC@6L
><80D@J4840<0@AD3040ND90F@C8:<LHE@NHB8K4:<N<9H6<<HB8IDHHG@<4N<DHA
HK@O80804B<=@C8:0GHD@44A<MLL8LH1DK4HHH004240@@@A03048=4;<E0G0G4>@
NHJ48@>@N<ED>0KH3D2<78N@;D5@C<4@=HLHJ0C4:8@H1HCD6@=HNLD<FH4@C@J4D
@1HK<0H6@EDCL68>8:45DJ0N@M0NL@<9@F8<D<DH4D4B80L5H882L5<<4K0J@=DC8
;@;<GL0L@H1<C0;0OHC468FHOHI8A8L4<H=H8448=<58244<>DK@A@74:8HH5D9@C
HHDH@>04DA@;D1HEL<HLDHD@0A4:<I<B@7@=DK82H?8>8N8CH8L9<9@4H:DK@D@D4
3<84B4A4M@A44L><HHD@<4H<LH=D7<=LL048F<3L:@F<CLIDL@BHJ<M@0L2<LL9HJ
D=018H@G0?4E<C4G@4D;DB@8H9L;43@7<:8?L14AD4424OD844@1@CDF0HL24D<<H
5@ODN810<<>0M<N4F<40DHF@4@A0B48H>@LDAD3@F860A00L=8@DCLB4A4KHK0MH<
4EH6@>@J82HA8?0H8C@G<J8G0>DBL3@74>8B8?DE45LE49D=88HC<M8?888G4F@1@
2D74>DM0D0D4288H1@;<<@3D14?4N<@H9D24G@@0?L$000@L0I004240@@@102440
38500004:81L9DH8I@;40<481D10C0F@8D;L3H64?4><4HIDC040=HH8F0I4D<DLA
@;@K8=H5LC4BLJD@HJD546<FL?8>@J@00240<@@I@MHE8B0O4B4M06L@@IDC<64=<
C8G@44:<2H2L<01LB@60>@M0:HB8K<?0181L;HM@24L<=8J050;<18JHI@@4;8>L8
@J8K08D6@G@=@EHD@>48<LHIDCD4@=HI@G@BD@8@@L4D0G@C4B<@H9HC8FLLDGD40
A884N<0@<H2H:@7480K0C0;4B0IDE0;400FDI0>4F<@D2H6L<8K0=@@@1@C01DA<>
4N<M4;8=LC81DC8KL>88HODG0>0I<IL3@G88LA028I0B<74<<J8F0<4K<@064=LL0
5H2<CDLD1L<L28LDI@?<A@J@>46<LH9034FL=H<D2<K<384DM<O4C<N0ML9@:@@L=
D24=8:8>H8DG<;<I@74@44HK4MHI83<74<@74DHC@K0C0F4>@A@:H@0A8C@78>@J0
:0144<@HEDO8=04HFHC<:0J<D4;8=<4H@8@H3DIDC@6@><@DE@24F@<LL@9D3D74=
4J414?D=DB46448DL9@3@B0ND2D0<0H9@1@M4><DL58=HJ8J03DLL94=LNL70E4J<
0H943074=DMLB82<@<IHLDALIHB@64<4K0D8<02<C860><I8:@MD48A<MLH<4@ADC
<688LL@@@@4@<2HEDBLJ<305L5048:@10684@E@303HJD0@:<M0BH10G8=@8HH@GH
=@?D9@M0NDN40H5HLL:4<H8D9@H@JHC@IDI@@H0<OH04$000@2@@000E4@L54>LI8
B@@48<4D1LC@6840J8@0@004D844MDL<D@9H3<64<DL@9@D4;<3L><ML2@0<4HDHB
LJD0HJ0C4684H1@K<L@242<B<HL3<68<DLHB8GLGDL@O<B0J8M08D10D@5LELM4A0
90C874>@KH:HB06@=LK@J8F8C0:@9<;4K0O86048DL9@3@20>8>4?HDH?DE8G0948
<<L5H7HJ@O8?00<BLN<50F<484H<8=<IH<H4HDH6L70E0I490A@4L>H3<<@8@8HBD
74<DI0L8B<LLJHG<1D@HA<C@D044ND=898;<6H@48D149D?4:<8LIHK08H0@HD4HG
@B8N45DD@B@64A<JH0D=8A4@<G83LI<;8K<@84D5L38?LL<O84<O0;4G<3@54L<FH
;HH8AHCDG0E0E44080EDDL60=DI8J07DJ4M02@:DD0@HG@=40<LL=D:DG0D4A<L0>
8IH38H4DDM4=<KH1D:D486@58L8@H5@<8C<4@=HHHI0HDF<F@DH=<JLBH9LH07L$0
00@<0@0=0D0000@907D70?48<DH1@A04040645DA01@14L<4H1@C<7@><J8I@04B4
2HJLA0A8B@409HI4:H64I4:H84L4I08<=H0<3<:<HH1DCD4L>0M0D@?4K<68K4=85
LO4MHE4B8<@M0;4I4H@NDC0884LA@3@78:@J8F@5D7H>8>4B4DHJ<3<G0K@I00D1@
C0309LMLIL3<JL8<3470:DLHB@44A<NLG@6H@<N84H=DI4F@4D<0486D9LIH8L2<D
<9@1<306D>4IDC8@@H41<8LE@J87<O4L8O80@E4;<5@J<=0EHL@A8M4JH2L4<G<FL
N0E4KHC86848DL9@;@B@40=4DL58=HJ8J08D20?0:D68LL:<<H8D9@L@LHC@JD9@=
@FL7<<DA<1@BD7@>0I8D88@L8D@9H3<64<DL@K8H@=0:8F4K84078:<HH@@<4:<2H
0H3DJ8F4=4ID=@=D34E4L<<H=@N@9LA<<<>@BHH@IDB@6L>DL@A@8DH0385<=LK02
H60<L24H88@8<7L54<DI@D8>D?4:8@L5H;8F@J@9D:05<9034ED4DL85DE83<B<;@
:8?@O8M4>42@ED@L:8F@3H9<L4FHJ@J02848>L30A@2LF04@=HL02HC44@=DL0B@4
42<HHID;00@;HKHD@N0>@6<B8HH1DK4C02LN01L$000@LH@0900<480HA00H1880@
0J@@<B46@=HI0=0544<LL9D;4H@8H88KHJ084A<=<J<BL8L:<I8G0C4B<@H9H38G<
?D?4=4F<GD<@=H:HKHF0D42<LH9@;4?@3@9HKHB0=D:8202060I42H:8I8C08DM<N
8D@1HCD54=LM8I034A<J0@LI0:0?@1@8<KHF@@4N<HH=D54D0A<5L6@FDA@I0D4<<
8@9HC47040L@L8M8J<7H:DK@2HM4M028C<I43<G0C@8LC42D6424;<><6H6<64GDM
HB@540<@L983H70<DN4I474E4J<8H9@34G46D;8CL2H2L9@9@5LE<1D5@?0HH@@<4
A<:D482D;DJ<88GLDH@H2H5<6H=L:4HDEH647D644<DDAHK<8@4DB<=@8DLD=DDDI
414L<>H742L1H6D641H5D?H<@N4MH4<B8<H1H3D74=4H@J@D4B<FHC@48K038A44L
A0BH48FLHD5@ILC@F@10>8D4484DA0:<F86D8HK0@8H8B4LLAH=@M@3@N<0@=HO@6
HBL=@AD64=H9LBD4@8<N40H2@NHD0B8DH=D1@A4A4:@G4BD3<G4@0042<L<M4OD?4
L<N0;4BDG450;8JH<H:0KHD@>48<2LA4E<A4C@9D7<5D<0<88@7<:L@DH41<8LE@J
83<ALCLE<DL=HF46@MD98EHC0MHB@7H4<G<FLN0E43H0HD@@D0DA404OL$000@80@
0N@<418CD6L>0A@I0542<0L@@3@2064I8E@A0040<8@0<@DJ8C4=@:HHD9D3878><
80D@04642<K<MD9HC468>0E0L@@4:<NHIHK0?@C@J@=44<DHA@K@M8EDMLL@A8ALH
@=88<M09@342<@H=DF8A494>HM8I<=<78D8:8DH=D0DB02<@H9HKDJ8MDF0=4F4GD
<@FH54;8=HH8:HO8:HB0>42<KLE0A03<F8A0=DB8G0344<6L788@90JH@4<85DLHL
@1DK4<8242@JL@8I0B060=HA<:0CH74=4LHL8ED808D9820DL<@=<9@3H8464?4<8
38:45DH@K@6HDHA@3<789LL0J094N<FH<DF86DHHE07D:DB81@7D5<C4?0KH;L7L:
@J8F@54G<HDB470C43<G4@0042<L<J@OD?4L<N0;0BD74<DI0D8>0>HC884?4B<HH
1D;DLD=0D@LHI4K4J@JH088H9D;@F<4H<4N0H824E<N@HH1<M0M8E4;<5@9DGDB85
<581D8H>H=LL4:<GD6DID=0A@K@C4J42D3474@41D?0I06@AHA8I090F@100<OD4<
J87<L03L$000@80@0N@@498C86H<DDHJ0540<DLI8C@68<@80D@04040<8@0<0D40
I4:H:0KHD@>48<<LMHAD<8H08@=0CD;@80I0=D80C42H60=8B8EDC8@@H4A<CHGH>
@9HCH<@BL40>DM0G@9DC<G4B84<DHBLB<6L<@I8I@4D?L?<I4>LILB@6@?8I8L8@<
M0I<=<78G8N88HIH3@788<H8:H?0;82DB<10BD6L=@I8I014L<<H=@ODBH8@A@8DL
<L<28A<A<=8=03DF4148<2LH40L:@J0I05D7H=03<8@2H=L2HD8<DI<9D306H?4LH
D@C4A<IL40505@ADKHH0D4B<LHAD;<?0A@8L4LA@3@788HI<;4;@?@K0<@DL58=HJ
8J08DA070MD5<6@LL:<<H8D9@L@LHC@JD9@=@FL7<<DI8H0D4B80L5H@8?H:L8@CD
6H<8I8I06D4LD<J0?@ALJD0HJ4C468FHD050A<<L8D0@5HB@ID2474<4L0D0EDDD4
@=HI@G@BDL8@@EHDHD0?4><HL5DM4?<I4<898C86H>DLLH4LDN02@4L;L484<G84@
A<H4>094?0FD>HK8B@O468BLH06@C@F@:<30F4ADEH94=D2<8<4H=D6<0HID;4D81
D9DD8=D;4F0?<AHB8684HH@>@DH=D<@284@8@DHA@C4F0D4<H88K4M4602LD4<<@8
EH743060<02864KHLD5H:8BL6<=DJ8G08D>438C@6@>HL@B@LD4@A4K8FL4D5@78B
<08OH04$000@2@@000C4@<C@60=DL0J094J<DH=@1<40<0@0=0I09DI8F0D4N<@H=
D;8G0@0044<4HJ4<H1HC878=HM0KH4H8HC42D64<@J86H>@I8:HN<9D<@K@4@78G0
?4J<2HKL84EH8H90>@F0L<:H7<:H;41<306HA478=DH8L0BD4H6DA44H=09<<HC4O
8<8FLNHL<F<345HA49H<8KHB054N<HD9DCD6H;LL0G@94;<?4><80D@ED24C0@@<D
H8J@5D;L;L3DL<?D>484?@54L<4HA@K0G<28FDM0D8DH:04LIDK07<28@H48B<<H1
H3@6H<4N8?@?40<@L5H4L948@0@FLG0BH2<74=4IHC@544<2LCL=@@DC<8<2LK<C8
M0LDLH=D<D@@5D4@FD64MD68LHAD3<7<=@J8F@948<2LJLLD=DD4;4DHI@?@=4:<D
HID3<74?4>4FHEL<0<DH8B05DM4=D@D=D24H44D<<A<88K8I8HH>D64;<?D<<A<84
B0D4G06@N@BHGH6L;LJ8G05D?<;LNL3<;4E@K8DLHH4<5<0<NL?H<@I88H?86@=4M
LK8ELO4F8?8A05008LLFH:0O<38OHH@4D;D20J@C4;<<D<44<7LF8F4K0C@F4HDDL
A@;<E@HDH898=0><>46H@D@<?4J4M<8L38<4H@K8EH509@CLKHI0CDIHF@5DGL6@=
DD8=DH4H84H4HKHFLFLB0?4A<C8G01H6@8<OD0@2HKHH44H6HL414EDA@3DG8B454
B8GLA4KH942D8<ED>L2HE88DIDBD4@9<@@;@L@B0HDD4D<08IL2<0DO@0<$000@H8
A004B40H8@1@201D2@@000C4H<3@74<<LHJ0540<<L=HC8H0D@;DH8A@348<2L:L8
H9@3H70<4LHI@HDFD>0N<LH14C@D@6D4@NLDH8@8H>@L@L@D4N8<HI0C<FHFDM<0@
A48H=4K@JHJ43474<4K<=0:8@H1HC86L<@I4B@O8<HO<N@5LL03L$!604ba4ef