DDS信號發(fā)生器電路設計方案

。直接數(shù)字合成(DirectDigitalSynthesis、DDS)是一種新的頻率合成技術和信號產生的方法。直接數(shù)字頻率合成器(DDS)具有超高速的頻率轉突出優(yōu)點。因此這種份。系統(tǒng)時鐘為f輸出頻率為f。根據(jù)公式f=f可知，只要選擇恰當?shù)腸lkoutoutclk頻率控制字，就可以得到所需要的輸出頻率f。outROM找表，其部存儲一個完整的正弦波的數(shù)字幅度樣便實現(xiàn)了從數(shù)5、低通濾波器(LPF)DA的波形是梯形狀的，將它通過低通濾波器后就可以看到平00p預分頻模塊由32位加法器和32位鎖存器構成。根據(jù)公式f=f可知，outclkN為32，f=50MHz，要使f=220Hz，只需求出M的值，然后對其進行累加。clkout根據(jù)公式f=f可知，要使輸出頻率可控，則DDS累加器的位數(shù)要與outclkout控制模塊塊模塊因為如果包含低位，則一個周期中將會出現(xiàn)的多于28(256)個值，就不能、*CS：片選信號輸入線(選通數(shù)據(jù)鎖存器)，低電平有效；*WR1：數(shù)據(jù)鎖存器寫選通輸入線，負脈沖(脈寬應大于500ns)有*XFER：數(shù)據(jù)傳輸控制信號輸入線，低電平有效，負脈沖(脈寬應1&5、偏置平衡(調零端)1&8、偏置平衡(調零端)使輸入端(即2號腳)開路，用萬用表對OP07芯片輸出進行調零，由反向⑦低通濾波器(LPF)使輸入端(即3號腳)開路，用萬用表對OP07芯片進行調零。二階低通件(VectorWaveformFile)，然后將要進行仿真的節(jié)點(Nodes)添加到仿真文件中，保存后打開仿真工具 (SimulatorTool)，選擇功能仿真(Functional)，生成網(wǎng)表(Generate告文件(Report)。通過公式f=f求出的M的值為“1000”來一個時鐘outclk由于f=M，又因為輸出頻率圍為50Hz~10kHz，所以進位高位的進位較out3、使用了示波器部增益()；。位器，便于對低通濾。轉IBRARYIEEEUSEIEEESTDLOGIC1164.ALL;USEIEEESTDLOGICARITH.ALL;USEIEEESTDLOGICUNSIGNED.ALL;ENTITYzhishuISPORTMOUTSTD_LOGIC_VECTOR(31DOWNTO0));NTITYARCHITECTUREfuncOFzhishuISINM<="1000";CHITECTUREIBRARYIEEEUSEIEEESTDLOGIC1164.ALL;USEIEEESTDLOGICARITH.ALL;USEIEEESTDLOGICUNSIGNED.ALL;ENTITYbcxuanzeISPORTbcxzmaichongINSTDLOGICbcBUFFERSTDLOGIC_VECTOR(19DOWNTO0));NTITYARCHITECTUREfuncOFbcxuanzeISSIGNALbcSTDLOGIC_VECTOR(19DOWNTO0):="001";SIGNALbcSTDLOGIC_VECTOR(19DOWNTO0):="010";SIGNALbcSTDLOGIC_VECTOR(19DOWNTO0):="010";SIGNALbcSTDLOGIC_VECTOR(19DOWNTO0):="100";SIGNALbcSTDLOGIC_VECTOR(19DOWNTO0):="000";SIGNALtmpSTDLOGICVECTOR9DOWNTO0);INESSbcxzmaichongINngEVENTANDbcxzmaichongTHENbcbc;bcbc2;bcbc3;bcbc4;bcbc5;bcbc;ENDIF;ROCESSCHITECTUREIBRARYIEEEUSEIEEESTDLOGIC1164.ALL;USEIEEESTDLOGICARITH.ALL;USEIEEESTDLOGICUNSIGNED.ALL;ENTITYkongzhiISPORTkeyINSTDLOGICICM:INSTD_LOGIC_VECTOR(19DOWNTO0);foutBUFFERSTDLOGICVECTORDOWNTO));NTITYARCHITECTUREfuncOFkongzhiISINCESSkeyclrINDkeyTHENutMENDIF;ENDIF;fout";ENDIF;ROCESSCHITECTUREIBRARYIEEEUSEIEEESTDLOGIC1164.ALL;USEIEEESTDLOGICARITH.ALL;USEIEEESTDLOGICUNSIGNED.ALL;ENTITYxianshiISPORTfoutin:INSTD_LOGIC_VECTOR(19DOWNTO0);ICnumOUTSTDLOGIC_VECTOR(6DOWNTO0);numOUTSTDLOGIC_VECTOR(6DOWNTO0);numOUTSTDLOGIC_VECTOR(6DOWNTO0);numOUTSTDLOGIC_VECTOR(6DOWNTO0);numOUTSTDLOGICVECTOR(6DOWNTO0));NTITYARCHITECTUREfuncOFxianshiISecINTEGERINVINTEGERfoutinCESSclkINDclkTHENCASEdecREM10ISWHEN0=>num1<="1000000";WHEN1=>num1<="1111001";WHEN2=>num1<="0100100";HENnum0110000";HENnum1<="0011001";HENnum0010010";HENnum="0000010";HENnum111000";HENnum<="0000000";HENnum<="0010000";HENOTHERS=>num1<="1111111";CASECASE(decREM100)/10ISHENnum="1000000";HENHENnum"0100100";HENnum0110000";HENnum2<="0011001";HENnum0010010";HENnum="0000010";HENnum111000";HENnum<="0000000";HENnum<="0010000";HENOTHERSnum<="1111111";CASECASE(decREM1000)/100ISHENnum="1000000";WHEN1=>num3<="1111001";HENnum"0100100";HENnum0110000";HENnum3<="0011001";HENnum0010010";HENnum="0000010";HENnum111000";HENnum<="0000000";HENnum<="0010000";HENOTHERS=>num1<="1111111";CASECASE(decREM10000)/1000ISHENnum="1000000";HENHENnum"0100100";HENnum0110000";HENnum4<="0011001";HENnum0010010";HENnum="0000010";HENnum111000";HENnum<="0000000";HENnum<="0010000";HENOTHERS=>num1<="1111111";ENDCASE;CASEdec/10000ISWHEN0=>num5<="1000000";HENHENHENHENHENHENHENHENHENHENSEENDIF;num"0100100";num0110000";num5<="0011001";num0010010";num="0000010";num111000";num<="0000000";num<="0010000";OTHERSnum<="1111111";ROCESSCHITECTUREIBRARYIEEEUSEIEEESTDLOGIC1164.ALL;USEIEEESTDLOGICARITH.ALL;USEIEEESTDLOGICUNSIGNED.ALL;ENTITYzhuanhuanISPORTzh_in:INSTD_LOGIC_VECTOR(19DOWNTO0);ENTITYfangboIShoutOUTSTDLOGICVECTORDOWNTONTITYARCHITECTUREfuncOFzhuanhuanISINPROCESS(zh_in)INzhoutzhinzhoutzhinzhoutzhinzhoutzhinzhoutzhinzhoutzhinzhoutzhinzhoutzhinROCESSCHITECTUREIBRARYIEEEUSEIEEESTDLOGIC1164.ALL;USEIEEESTDLOGICARITH.ALL;USEIEEESTDLOGICUNSIGNED.ALL;PORTfbinSTDLOGICLOGICfboutOUTSTDLOGICVECTORDOWNTO));NTITYARCHITECTUREfuncOFfangboISINPROCESSfbinfbclk)INANDfbclkTHENFORiINTO7LOOPfbouti=fb_in;LOOPENDIF;ROCESSCHITECTUREIBRARYIEEEUSEIEEESTDLOGIC1164.ALL;USEIEEESTDLOGICARITH.ALL;USEIEEESTDLOGICUNSIGNED.ALL;ENTITYxuanzeISPORT(xzmaichong:INSTD_LOGIC;OGICVECTORDOWNTOOGICVECTORDOWNTOOGICVECTORDOWNTOOGICVECTORDOWNTOoutputOUTSTDLOGICVECTORDO