?????????? (DDS)

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??????????(DDS)

• ???? ????
• ???
• Tel [phone]

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??????????? ???????????,?????.
??????,???????????????????.?? 1,????????? ?????
???????????,??? ????????,?????????? 2,???,??
????? ?????,?????,???????,???,????????.
DDS??????????????,????????????,?????????????.
3
????????

• ????????
• ????R,L,C?????????????
• ???????????????
• ??R
• ??L
• ??C
• ????
• ?????VCO
• ???????(?)?????????
• ?????????????????
• ??????
• ?????------??? PLL
• ???????(????????)------???????????????
  ??,?????????,????,????
• ???????------DDS

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VCO--???(?)??????
??C
??R
??L
????
5
????????

• ??VCO?????????????
• PLL????????????,???????(?????)

PLL????
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PLL???
??????????????, ????PLL?????. ????????? ??
?? ?? ??????? ,, ?? ????????????????,
??????,?????,?????? ?????????. ???????????? N?,
1/N, FL
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PLL
??????????????,?????????????????. ??????????,PLL?
???????,??????.
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DDS

• 1971?,?J.Tierney ?C.M.Tader ???
• A Digital Frequency Synthesizer????????DDS???,
  
• DDS?DDFS ? Direct Digital Frequency Synthesis
  ???
• ???????????????.
• ???????????????,??????????????.
• ??????????????????,?????????????.
• ????DDS????????(AWG)

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DDS??

• ?????
• 1, ???????????,??????D/A,???????.
• 2, ???????????????
• (1),?????????CLOCK???, ???????????.
• (2), ?????????????????.DDS?????.
• ????????????????.?????????????,
• ???????????.
• 3, D/A????????,???(??)??,?????????????.

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?????????
12
                                                                                                                                                                                                                                                                              

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??????????2N, Sin?????2p,?????P?????Sin?. ??Clock?
???fc, ????????1????????????? ??M????,????????
M???????
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?DDS???????????,??????????????????,??????,????????
??,????????????????,??????????????????????????????
?????,?????????? 0360o ??????????????????????????
??????????,??DAC,??????????????2N/M ? fc
?????????,????????????????????,??DDS??????????????
???? ??? ?????????????????????????
??N???????????????????????????????,???????????????
????,??????,???????????,?????????????33,?????????
????????? ???,?????????????????,?????????????????,
??????????,??????????????????DAC????????????24??










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???????????????????,DDS??????? ????????????????
??????????????????,??? ?PLL??,DDS????????????,?
??????,??DDS???????,????????????,?????

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DDS
???????????????????,??, ????????D/A?????????
????? ?????????????,?????????? ??????,?????????
DDS?????????,???????,?? ????????????,???????,?
?? ?????????????? ?????????,???????????, DDS
???????????????,?????? ??????
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AD9830
???? 5V???? 50MHz?? ??????? ??10?????? ?????? ???
??? 250mW?? 48???????(TQFP)
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DDS???????
???????-60dB,????????? ?????????,????????????? D/A
????????????????????, ????????????????????? ??????
?,?????,?????, ???????????,???????? ??????,???????
???????
?????????
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DDS???????
DDS???????? 1, ?????,????????????? 2,
???????,???DDS?????????DDS??????????ROM???????????
??10Hz??,??????????10Hz?DDS???????????? 3,
?????????????????????????????????????????????????
? ?,????????????DDS??????????????????D/A?????????
???,??????,??????????,???????????????????????,????
????n??????Sin(x)/x???????????????6?19??? ?
D/A???????????,???????????,????,?????????????
S/DN 6.02B1.76
dB ??B?D/A???,??10??D/A,??????60dB???
??D/A???,????????????????,???????,???????????????
(??????),???????????????????????????????,?????????
?????? ? ????????????????????ROM??????????????????
???????????????????(???),??????????? ?
D/A????????????????????,??????????,???N???????????
????? ?,??????,??????,???????????
D/A???????????????????????,?????????????,??,??????
??????????
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DDS???????

• ????????fspur?????f fc - f0 ?,??????????????????
  ????????????

• ????,?????????????

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????,??????
??????????????????
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DDS??????
??

• (1)??????????
• ???????50fs(???)??????????????????????????????,?
  ????????????40fs?
• (2)???????
• DDS???????,???????,??????DDS?????????????,?DDS???
  ???????,?????????????????????,????????????,???????
  ???????,???????????????????,???????DDS????????????
  ??,?????????????????????
• (3)???????
• ???fs?????,DDS?????????????????N???????????????N?
  ???????????????,???DDS?????1Hz???,????1mHz?????
• (4)??????
• ??DDS????,??????????????????,???????????,????????
  ??????????,??????????????
• (5)????????
• ???DDS?????????????FM?????PM?????AM,?????????????
  ???????,??FSK?PSK?ASK?MSK??????,???DDS????????????
  ??,???????????,??????????????????????DDS??????????
  ?????????,????????????

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• (6)????
• ??DDS??????????????,????,????????????????,?????,
  ??????,????????

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DDS?????,?????

• (1)????????
• ??DDS??DAC??????(ROM)???????,??DDS???????????????
  ?CMOS?TTL?ECL?????DDS???,?????????MHz?400MHz?????G
  aAs???DDS????????2GHz???
• (2)?????
• ??DDS???????,???????????????????????????????????
  ??????(??????????)??????DAC???????????

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??DDS???????

• Qualcomm??
• ?????Q2220?Q2230?Q2334?Q2240?Q2368,
• ??Q2368??????130MHz,????0.03Hz,?????-76dBc,?????0.
  1µs
• Sciteg
• ADS-431,
• 1.6GHz,???1Hz,??-45dB,?????
• Stanford
• Micro Linear??

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Micro Linear??????????????DDS??

• ML2035
• ??(1)????????25kHz,??????12.352MHz??????????1.5H
  z(-0.750.75Hz),?????????-???Vcc(2)?????,???????
  ???????,??312MHz??????(3)???3?SPI?????,????,????
  ???????(4)?????????????
• ML2035???????(025kHz),?????????????????????????2?
  ML2035????????,??AMS3104(??????)?ML2031/2032(?????
  )??,??????????????
• ML2037?????????DDS????,????????500kHz?

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AD?????
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?  ? ????(MHz) ????(V) ????(mw) ?     ?
AD9832 25 3.3/5 120 ????,????,??D/A????
AD9831 25 3.3/5 120 ???,??,??D/A????
AD9833 25 2.55.5 20 10????uSOIC???
AD9834 50 2.55.5 25 20????TSSOP?????????
AD9835 50 5 200 ??,????,????,??D/A????
AD9830 50 5 300 ??,????,??D/A????
AD9850 125 3.3/5 480 ??????D/A????
AD9853 165 3.3/5 1150 ?????QPSK/16-QAM????
AD9851 180 3/3.3/5 50 ??????D/A??????6????
AD9852 300 3.3 1200 ??12??D/A??????????????????????????
AD9854 300 3.3 1200 ??12?????D/A?????????????????????
AD9858 1000 3.3 2000 ??10??D/A????150MHz??????????2GHz????
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AD?????

• AD9859 400 MSPS 10-Bit DAC 1.8 V CMOS Direct
  Digital Synthesizer
• AD9951 400 MSPS 14-Bit DAC 1.8 V CMOS Direct
  Digital Synthesizer
• AD9952 400 MSPS 14-Bit DAC 1.8 V CMOS Direct
  Digital Synthesizer with High Speed Comparator
• AD9953 400 MSPS 14-Bit DAC 1.8 V CMOS Direct
  Digital Synthesizer with 1024x32 RAM
• AD9954 400 MSPS 14-Bit DAC 1.8V CMOS Direct
  Digital Synthesizer with 1024x32 RAM, Linear
  Sweep Block, And High Speed Comparator

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??DDS???????

• 1, ?????DDS?????????
• 2, ????IC??????,??? CPU,RAM,ROM,D/A,CPLD
  ,?????? ??
• 3, CPLD,FPGA??

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?????????

• ?????????
• ??????????

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?MaxplusII??DDS????????????????????????????lmp_ad
d_sub??????,?????????????????????,????????????????
? ?????(ROM)????lpm_rom????,?LPM_FILE??.mif??????
??????? ?????????????????????,??????????????,????3
/4???,???????? ????????????,??????AssignGloban
Project Logic Synthesis???Optimize10(??),???Global
Project Logic Synthesis Style?FAST,??????????????
100MHz????FPGA???DDS????????????? ???FPGA????????
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DDS??????QuartusII?Altera?????????????????
Quicklogic????????Quicklogic ????
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??FPGA????DDS?????NCO (???????,???D/A)
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Verilog????????????
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include "romtab.v" include "claadd8s.v" include
"loadfw.v" include "loadpw.v" include
"sinlup.v" include "phasea.v" include
"phasemod.v" include "pngen.v" /






Project Name DDS


Author Daniel J.
Morelli Creation Date 03/04/96
215100
Version Number 1.0


Revision History


Date
Initials Modification



Description


This is
the top level of the Direct Digital Synthesizer



/ module
dds( RESETN, // global reset PNCLK, // PN
generator clock SYSCLK, // system
clock FREQWORD, // input frequency word from
external pins FWWRN, // low asserted
frequency word write strobe PHASEWORD, //
input phase word from external pins PWWRN, //
low asserted frequency word write
strobe IDATA, // I axis data QDATA, // Q
axis data COS, // digital cos
output SIN, // digital sin
output MCOS, // modulated digital cos
output MSIN, // modulated digital sin
output DACCLK, // DAC clock to signal when to
load DDS sin value DACOUT) // DAC output of
sin wave // Port types input SYSCLK, PNCLK,
RESETN, FWWRN, PWWRN input310
FREQWORD input70 PHASEWORD output DACCLK,
COS, SIN, MCOS, MSIN, IDATA, QDATA output70
DACOUT wire310 syncfreq //synchronous
frequency word wire70 syncphswd //synchronous
phase word wire70 phase // phase output
from phase accumulator wire70 modphase //
modulated phase value after phase mod block //
design architecture assign DACCLK
SYSCLK //---------------------------------------
------------------------ // this module is not
part of the NCO // this module is used to
generate random data // to modulate the NCO
output //-----------------------------------------
---------------------- pngen U_pngen( RESETN,
// global reset PNCLK, // PN generator
clock IDATA, // I axis data QDATA) // Q
axis data //--------------------------------------
------------------------- loadfw
U_loadfw( RESETN, // global reset SYSCLK, //
system clock FREQWORD, // input frequency word
from external pins FWWRN, // low asserted
frequency word write strobe syncfreq) //
synchronous frequency word loadpw
U_loadpw( RESETN, // global reset SYSCLK, //
system clock PHASEWORD, // input phase word
from external pins PWWRN, // low asserted
frequency word write strobe syncphswd) //
synchronous phase word phasea
U_phasea( SYSCLK, // system clock
input RESETN, // global reset syncfreq, //
synchronous frequency word COS, // digital
cos output SIN, // digital sin
output phase) // 8 bit quantized phase
output phasemod U_phasemod ( SYSCLK, //
system clock input RESETN, // global
reset syncphswd, // synchronous phase
word phase, // 8 bit quantized phase
value MCOS, // modulated digital cos
output MSIN, // modulated digital sin
output modphase) // modulated phase output
sinlup U_sinlup ( SYSCLK, // system clock
input RESETN, // global reset modphase, //
modulated phase output DACOUT) // DAC output
of sin wave endmodule
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??DDS??????

• ????????????????????????????????(DDS),???????????
  ???DDS??????DDS?(1)?????DDS??DDS????????????????
  ???,?????????????????DAC??,???????????????????????
  ?????,?????????????????????????(2)?????DDS(??4)?
  ?DDS??????????????????,???????????????????????????
  ????????,??????????,?????DDS??????????????????????
  ??????,??????????????(3)DDS????????DDS?????????
  (a)????(b)??????????????40(c)????????????????
  ????(d)?????????????????DAC???(e)?????????????
  ???????????DAC??????(4)DDS???????DDS??????(a)??
  ????????????????????(b)???????0?????40(c)???
  ???????ns??(d)??????????(e)????????(f)????????
  ??DDS?????(a)????????1GHz??(b)??????????????
  ???????????????DAC??????(5)DDS???????(a)DDS????(
  ??2)(b)DDS????????GPS(??????))???????????HDTV??
  ?

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DDS????????????????????????.?????,??????,??,?????
?,????,????? ?

• - ???????(LO)????- ????????????(RF)?????-
  ???????- ?????????- ????- VHF/UHF-LO????-
  ????- ????- ????- SONET/SDH ????- ???????-
  PSK/FSK/?? FSK ??

- ?????- ????- ?????- ??????- ???????-
????- ????????- ?????????- ????- ????-
????????(HFC)??? ???????-
????????????(FM) ?
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DDSPLL ???????
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• ??PLL????????????????,????????
• 1,??????
• 2,?????????????????
• solution
• AD9858 ????????DDS.
• ???N??,N???,??????????N??,??????,?????????????.
• ?????
• ????????????DDS,?????,??????,DDS?????????DC?1/2???
  ?.
• ??4,294,967,296?????,?1GHz?????,AD9858???????0.2
  3283Hz.
• ????
• ???PLL,????????????????20?????.,???N??????????????
  ???????,???????.??,?????????????????,???????????
  ????????.????????????????????????,?????RF?????????
  ??????????????.AD9858??????????(Gilbert
  Cell)???RF??????????.????????,?????????????DDS????
  ???.????????????? DDS????????????????????1?PLL????
  ??,?????????????????.

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???????AWG

• ???????RAM?
• ???????

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???????

• ??????
• DDS???????????