華中科技大學(xué)-IC課程設(shè)計(jì)實(shí)驗(yàn)報(bào)告(比例放大器設(shè)計(jì))

1、中科技大學(xué)題目：比例放大器設(shè)計(jì)系: 班: 名:口號(hào):指導(dǎo)教師:20XX年XX 月“虛斷”在模擬電路中對(duì)放大器進(jìn)行設(shè)計(jì)時(shí)，差分放大器由于能夠?qū)崿F(xiàn)兩倍放大和能夠 很好的抑制共模噪聲的優(yōu)良性能而被廣為應(yīng)用。本文利用放大器的“虛短” 的特性對(duì)比例放大器的結(jié)構(gòu)及放大器的構(gòu)成和基本參數(shù)進(jìn)行了設(shè)計(jì)，其中放大器采 用差分放大結(jié)構(gòu)。關(guān)鍵詞：比例放大器差分放大器一級(jí)結(jié)構(gòu) 二級(jí)結(jié)構(gòu)AbstractWhen designing an amplifier, differential amplifiers,with its twice higher gain and its restrain to Common-mode

2、 disturbance,is more widely used than other kinds of amplifiers.In this report,we make use of the properties of“ virtual short cicuitdisconnection n”d daesign the structure and parameters of the whole circuit as well as the structure of the amplifier.Key Words ： Proportion amplifier Differential amp

3、lifiers Level 1 Level 21ABSTRACTI II1 題目要求2設(shè)計(jì)過(guò)程2.1基本結(jié)構(gòu)及分析2.1.1外圍電路分析-2.1.2運(yùn)算放大器選擇工藝參數(shù)提取2.22.32.42.52.62.7理論推導(dǎo)與計(jì)算 仿真 二級(jí)密勒補(bǔ)償運(yùn)算放大器 仿真結(jié)果 綜合仿真.2.3.5.610.13.17結(jié)果分析與結(jié)論224 心得體會(huì)2325參考文獻(xiàn)26附錄271題目要求設(shè)計(jì)一個(gè)比例放大器，參考電路如下:要求:自行設(shè)計(jì)放大器的結(jié)構(gòu)與 MOS尺寸參數(shù)、電阻R1、R2的阻值，以達(dá)到相關(guān)性能指標(biāo)；（基于0.35um COMS工藝，MOS管長(zhǎng)度均設(shè)定為L(zhǎng)min=1um）(2)用HSPICE軟件仿真電路

4、。(3)電路性能指標(biāo)滿足如下要求:Vin 0.3cos( t) 0.7 Vn :Vout1:10 ；相位裕度45度65度； 輸入信號(hào)頻率 fjn 100MHz ；輸出電流I out 10mA2.1基本結(jié)構(gòu)及分析2.1.1.外圍電路分析指標(biāo)要求中隱含了增益要大于10倍，帶寬大于100MHZ，暫時(shí)不考慮相位裕度。如圖結(jié)構(gòu)來(lái)說(shuō)，根據(jù)放大器的“虛短”、“虛斷”特性，可以列出如下等式:Vin Vout VinR2 R1根據(jù)題目要求:Vi n: Vout=1:10因此，有:R1=9R2又:Iout=V in/R2=10mA,Vi n=1+0.1cos(wt)得:R2 100R1 900另外，信號(hào)中包含1V

5、直流電壓，相當(dāng)于為放大器提供了直流偏置且 Vo=10Vin=1v， 取工作電壓為單電源3v 外圍電路設(shè)計(jì)至此結(jié)束，現(xiàn)在進(jìn)行放大器內(nèi)部設(shè)計(jì)。2.1.2運(yùn)算放大器選型由于輸入信號(hào)的特點(diǎn)，其中同時(shí)包含了直流與交流電壓，考慮到信號(hào)噪聲以及 直流電壓波動(dòng)，使用差分放大電路能對(duì)共模輸入起到很好的抑制作用，因此本設(shè)計(jì) 選用差分放大電路。由于差分放大電路增益并不算高，實(shí)際中多采用Pmos有源負(fù)載 以提高增益。在這里，我們選用以電流鏡為負(fù)載的差分放大器實(shí)現(xiàn)所要求的運(yùn)算放 大器。電路如圖所示：VDDM4M3Vi1M1M2Vi2IbiasGNDNMOS器件M1和M2作為差分對(duì)管，PMOS器件M4 , M5組成電流源

6、負(fù)載。 電流Io提供差分放大器的偏置電流。其中 M1、M2參數(shù)全同，M3、M4參數(shù)全同。， 設(shè)所有管子都工作在飽和區(qū)，如果 Vgs1=Vgs2，由對(duì)稱性，Id1=ld2=ld3=ld4。差分放大電路的輸入輸出有許多組合，本設(shè)計(jì)僅采用雙端輸入單端輸出，因而本 文僅對(duì)這種情況簡(jiǎn)要介紹。當(dāng)從Vi1輸入差模信號(hào)，Vi2=0 （交流小信號(hào)），設(shè)Vgs1增大，貝U相應(yīng)Id1變大, Id2變小，輸出電壓Vo=Id2*Ro ;當(dāng)輸入共模信號(hào)，Vgs1恒等于Vgs2，則Id2不變， 輸出電壓也不變。這樣就相當(dāng)于差模輸入放大，而共模輸入抑制。F面對(duì)具體參數(shù)進(jìn)行設(shè)計(jì)。2.2工藝參數(shù)提取重要工藝參數(shù)并沒(méi)有在本設(shè)計(jì)使用

7、的 0.35um工藝庫(kù)中直接提供，需要提取。工 藝庫(kù)提供的參數(shù)為：Tox= 7.00000E-09 mUn= 4.0045690E+02cm2/(VS)Up= 1.7853294E+02 cmA2/(VS)0 ox由CoxK=0.5 口 Coxtox得 Kp 44,Kn 200為求值，需要對(duì)單個(gè)MOS管進(jìn)行輸出特性仿真。 仿真電路如下：M1V1V3OVdc得到如下曲線由Id2CoxW(Vgs Vth)20Vdc12L(1Vds)KW(Vgs Vth)2(1Vds)K已知 取 WL=1，固定Vgs，則在飽和區(qū)取兩數(shù)據(jù)點(diǎn)可得仿真單個(gè)nmos管特性vgs = 3.0000vth=604.6282mv

8、dsid4.2222.9325U4.3223.1347UKn=200lambda n=0.01仿真單個(gè)pmosvgs = -3.5000vth=883.4507mvdsid-3.6-108.9378U-3.5-108.5570UKp=44lambda p=0.04n0.01, p 0.042.3理論推導(dǎo)與計(jì)算對(duì)于上圖所示差分放大器，電壓增益為VoAo gm1(r2|r4)Vid其小信號(hào)等效電路如下:Gl G2a- '眾-Qi_' I f"腫I咖心，貝02=I応fp加了腫I咖S3XoIIA廠2亠L(fēng) 兒訶! D S4列出電路的傳遞方程:gmNoNVi2roProNCACL

9、S( 2roProN )CAroP(12gmNroN)CLs 2gmN (roNroP)第一極點(diǎn)Wpi2gm p(roNrop)(2roNoP )Carop(1 2gm 卩3)6可近似為Wp1因?yàn)?gmProN1.在達(dá)到第一極點(diǎn)之前，從傳遞函數(shù)知增益恒定，當(dāng)接近第一極點(diǎn)時(shí)，電路的增益開(kāi) 始下降，在3 = Wp1時(shí)，增益下降3db,之后增益以-20db/dec的速度開(kāi)始下降，直到 接近第二個(gè)極點(diǎn)。對(duì)于一級(jí)放大而言第二極點(diǎn)的影響可以暫時(shí)不考慮。1f1 由22(roN | roP )CLroN: , roP又n IdroN |心1(np) I D由入、負(fù)載電容CL、則f1f1只能由Id決定。電流Id

10、共同決定，其中Cl不變，入為工藝限制參數(shù)，則取Vgst1 0-2V （參考文獻(xiàn)【11）% v (2)VGST1 In p 丿=200該設(shè)計(jì)最小增益應(yīng)該為10倍，帶寬100MHZ，GBW=109 則 f1=GBW/A0=5MHZ本設(shè)計(jì)取取f1為10MHz，CL =5pf,則ID=6.25mA，則根據(jù)上式計(jì)算可得roN l|roP(1 p)Id =320。最后，由于Id和Vgst1都已確定?？筛鶕?jù)MOS管在飽和區(qū)的電流特性W2KWgs Vt）23550。分別得出M1，M2的寬長(zhǎng)比為W 781.25,M3，M4的寬長(zhǎng)比為W（注：本文未作特殊說(shuō)明處均取 L=1um）此電路中用作恒流源電流等于兩支路電流

11、之和，丨REF 12.5mA2.4仿真網(wǎng)表見(jiàn)附錄。電路如圖:結(jié)果如下：靜態(tài)工作點(diǎn)（略去不關(guān)心的參數(shù)）* mosfetssubckteleme ntmodel regi on idvgsvds0:m10:n_33Saturati on6.2500000m959.7753743m1.91150040:m20:n_33 Saturati on0:m3 0:p_33 Saturatio n0:m4 0:p_33 Saturati on6.2500000m 959.7753743m1.9115004-6.2500000m -1.0482749-1.0482749-6.2500000m-1.0482749

12、-1.0482749ac analysisfreqvolt dbvolt p hasevovo1.0000000015.0444475-6.8749998u1.2589254115.0444475-8.6551116u1.5848931915.0444475-10.8961398u1.9952623115.0444475-13.7174277u2.5118864315.0444475-17.2692179u3.1622776615.0444475-21.7406582u3.9810717115.0444475-27.3698659u5.0118723415.0444475-34.4566210

13、u6.3095734415.0444475-43.3783131u15.0444475 15.0444475 15.0444475 15.0444475 15.0444475 15.0444475 15.0444475 15.0444475 15.0444475 15.0444475 15.0444475 15.0444475 15.0444475 15.0444475 15.0444475 15.0444475 15.0444475 15.0444475 15.0444475 15.0444475 15.0444468 15.0444468 15.0444468 15.0444469 15.

14、0444470 15.0444471 15.0444466 15.0444463 15.0444454 15.0444448 15.0444434 15.0444413 15.0444376 15.0444317 15.0444233 15.0444093 15.0443869 15.0443509 15.0442953 15.04420627.94328235 10.00000000 12.58925412 15.84893192 19.95262315 25.11886432 31.62277660 39.81071706 50.11872336 63.09573445 79.432823

15、47 100.00000000 125.89254118 158.48931925 199.52623150 251.18864315 316.22776602 398.10717055 501.18723363 630.95734448 794.328234721.00000000k1.25892541k1.58489319k1.99526231k2.51188643k3.16227766k3.98107171k5.01187234k6.30957344k 7.94328235k 10.00000000k 12.58925412k 15.84893192k 19.95262315k 25.1

16、1886432k 31.62277660k 39.81071706k 50.11872336k 63.09573445k-54.6100615u-68.7499949u -86.5511176u 108.9614004u 137.1742793u 172.6921768u 217.4065723u 273.6986679u 344.5661914u 433.7831586u 546.1006154u 687.4999672u 865.5111389u-1.0896140m-1.3717428m-1.7269218m-2.1740657m-2.7369866m-3.4456621m-4.3378

17、314m-5.4610069m-6.8750002m -8.6551119m -10.8961405m -13.7174278m -17.2692181m -21.7406584m -27.3698646m -34.4566182m -43.3783081m -54.6100491m -68.7499679m -86.5510585m 108.9612810m 137.1740313m 172.6916801m 217.4055933m 273.6966956m 344.5622438m 433.7752833m158.48931925k15.0429273-1.0894891199.5262

18、3150k15.0420385-1.3714937251.18864315k15.0406299-1.7264248316.22776602k15.0383991-2.1730745398.10717055k15.0348654-2.7350096501.18723363k15.0292713-3.4417201630.95734448k15.0204197-4.3299757794.32823472k15.0064266-5.44536291.00000000x14.9843422-6.84388141.25892541x14.9495683-8.59332121.58489319x14.8

19、950183-10.77378011.99526231x14.8099391-13.47616012.51188643x14.6784156-16.79658713.16227766x14.4777810-20.82385333.98107171x14.1776087-25.61687645.01187234x13.7405937-31.17208476.30957344x13.1269495-37.38887617.94328235x12.3029068-44.053038110.00000000x11.2507989-50.861197612.58925412x9.9752452-57.4

20、89092515.84893192x8.5011802-63.672483019.95262315x6.8650378-69.258290225.11886432x5.1045630-74.209098231.62277660x3.2516690-78.575615339.81071706x1.3292659-82.460566450.11872336x -649.2715511m-85.988076763.09573445x-2.6795662-89.281015979.43282347x-4.7654994-92.4424422100.00000000x-6.9182417-95.5357

21、831125.89254118x-9.1542038-98.5607973158.48931925x-11.4904723-101.4294048199.52623150x-13.9368596-103.9572096251.18864315x-16.4863334-105.8946513316.22776602x-19.1096238-107.0079185398.10717055x-21.7605042-107.1775145501.18723363x-24.3917334-106.4476598630.95734448x-26.9722354-104.982062979.43282347

22、k100.00000000k125.89254118k15.0440652 -546.0849237m15.0438423 -687.4685801m15.0434883 -865.4485719m794.32823472X -29.4939701 -102.9514691I.OOOOOOOOg -31.9646259 -100.4269566電壓增益只有15DB，帶寬為8M，GBW=4.5 X 10八7<<10八9無(wú)法達(dá)到指標(biāo)。從推導(dǎo)中可以看到，無(wú)論增益還是帶寬，都相對(duì)固定，改動(dòng)的余地不大，再加上器 件的寬長(zhǎng)比有限制，所以在這種情況下要增加增益而不太多的犧牲帶寬是不太可能 的。事

23、實(shí)也證明用這樣一級(jí)差分放大要達(dá)到指標(biāo)還是相當(dāng)困難的，多次修改參數(shù)后, 任然沒(méi)有達(dá)到理想的效果。參考文獻(xiàn)【2】中對(duì)這種情況進(jìn)行了介紹。2.5二級(jí)密勒補(bǔ)償運(yùn)算放大器二級(jí)密勒補(bǔ)償運(yùn)放是一種性能相對(duì)優(yōu)越的結(jié)構(gòu)，由于采用兩級(jí)放大，能夠提供 相當(dāng)大的增益，而帶寬可以通過(guò)RC反饋網(wǎng)絡(luò)進(jìn)行一定的調(diào)節(jié)，這樣一來(lái)可以達(dá)到最 大GBW。于是采用如下電路對(duì)放大器進(jìn)行設(shè)計(jì)。VDD(P Iref1Iref2Vi1M1M2Rz , CcVo1丨111 'E2 1111 M4S12M6M301 3GND第一級(jí)GND第二級(jí)I負(fù)載如圖所示，PMOS M1、M2為一級(jí)差分放大，NMOS M3、M4做鏡像電流源負(fù) 載，PMO

24、S M6為第二級(jí)放大。電容Cc和電阻Rz構(gòu)成密勒補(bǔ)償。二級(jí)密勒補(bǔ)償運(yùn)放的增益一般可以達(dá)到 60db以上，本設(shè)計(jì)取增益為60db,帶寬100M 最簡(jiǎn)小信號(hào)等效電路如下：Vdoo+得到AoAIA2又,r。取 VGST2VGST60-2VCc卜rR, Ci=f= V，2 jGm2V,2 t R2Vogm1 gm2 (ro2 II ro4)( ro6 II r0l)1000I DVGST2VGST2V3ST6( np)A 4 105在過(guò)驅(qū)動(dòng)電壓等于0.2V時(shí)，增益遠(yuǎn)滿足設(shè)計(jì)要求。設(shè)Ci、C2分別為第一、二節(jié)點(diǎn)的對(duì)地電容，則電路的傳輸函數(shù)為(注意：沒(méi)有算上Rz)VoVinGm1(Gm2 SCc)RiR2

25、2as bs 1其中a C1C2Cc(Ci C2)RR,b CiRi C2 R? Cc (Gm2Ri R2,R R2)則第一轉(zhuǎn)折頻率為fd100M2 RRzQ Cc(1 GmR)2皐Gc第二轉(zhuǎn)折頻率為f. w 2.7（ GG + GQ 十 GQ ）rc電路其實(shí)為超前補(bǔ)償裝置，使電路的相角超前，電路零點(diǎn)為將零點(diǎn)移至轉(zhuǎn)折頻率附近則能減緩增益下降的速率，這就相當(dāng)于再增加了帶寬。 由于相位有45°以上的要求，應(yīng)使零點(diǎn)z位于1.2GBW處，并且讓極點(diǎn)p2位于 1.5GB處。（參考文獻(xiàn)取 Cc 2pf,Cl【11）3PF根據(jù)設(shè)計(jì)要求,GBW -gm12Cc 2性護(hù)Vgst1 4 105 100M

26、將所有的驅(qū)動(dòng)電壓都固定在0.2v，補(bǔ)償電容已定則?。?#165;）1（¥）2 57又因?yàn)閗WL(Vgs Vt)2Kp44,Vgsti 取 0.2V計(jì)算得出lOOuAKn 為 200,Vgst10.2V用同樣的方法計(jì)算得出W W匚)3 匚)4 12.56ID 300uA為了實(shí)現(xiàn)相位補(bǔ)償，讓零點(diǎn)z位于1.2GB處。 因此，RZCCgm1rz11.2由于 gm1 O-001Rz830讓極點(diǎn)p2位于1.5GB處，有g(shù)m6 1.5Clgm1Cc(1Cn3)CC其中Cn3為3點(diǎn)對(duì)地電容，包括Cgs6,Cdb4,Cdb2，其中 Cgs6 占大部分。取gm6 3gm1，由前面的計(jì)算可知,gm6= 0

27、.003計(jì)算得|D6 300uA(¥)6 37.52.6仿真結(jié)果仿真網(wǎng)表見(jiàn)附錄VDDIreflIref2Vi1M1M2Vi2CcVoCLM3M4M6GND0第一級(jí)GND -第二級(jí)負(fù)載電路如圖：對(duì)以上計(jì)算參數(shù)仿真后發(fā)現(xiàn)GBW僅停留在8X 10人7比單級(jí)沒(méi)有多少改善，與gm1成正比的關(guān)系，以及Cc與帶寬成反比的關(guān)系， 多次調(diào)整參數(shù)使得單位增益帶寬增大到了但是根據(jù)GBW10人8。結(jié)果如下：* mosfetssubcktx1x1x1x1element1:m11:m21:m31:m4modelregion0:p_33Saturation0:p_33Saturation0:n_33Saturat

28、ion0:n_33Saturationid-99.9999977u-99.9999977u99.9999981u99.9999981uvgsvds-1.0473706-1.0926733vthsubcktelement-1.0473706-1.0926733-829.4162414m -829.4162414mx11:m6954.6972789m954.6972789m655.5068344m954.6972789m954.6972789m655.5068344mmodel0:n_33region idSaturation599.9999862uvgsvds954.6972789m6.8990

29、087vth657.0844360mtnom= 27.000 temp= 27.000*two-stage op amp ac analysisfreqvolt dbvolt phasevovo1.0000000059.2376212179.99953541.2589254159.2376212179.99941511.5848931959.2376212179.99926371.9952623159.2376212179.99907312.5118864359.2376212179.99883313.1622776659.2376212179.99853093.9810717159.2376

30、213179.99815055.0118723459.2376213179.99767176.3095734459.2376213179.99706887.9432823559.2376213179.996309810.0000000059.2376213179.995354312.5892541259.2376213179.994151515.8489319259.2376213179.992637119.9526231559.2376214179.990730725.1188643259.2376214179.988330631.6227766059.2376210179.98530913

31、9.8107170659.2376211179.981505350.1187233659.2376208179.976716563.0957344559.2376201179.970687979.4328234759.2376196179.9630982100.0000000059.2376189179.9535434125.8925411859.2376171179.9415146158.4893192559.2376145179.9263713199.5262315059.2376100179.9073069251.1886431559.2376034179.8833064316.2277

32、660259.2375931179.8530916398.1071705559.2375762179.8150535501.1872336359.2375500179.7671666630.9573444859.2375080179.7068811794.3282347259.2374420179.63098701.00000000k59.2373366179.53544391.25892541k59.2371696179.41516601.58489319k59.2369058179.26375261.99526231k59.2364869179.07314912.51188643k59.2

33、358239178.83322323.16227766k59.2347726178.53123343.98107171k59.2331075178.15116865.01187234k59.2304692177.67293006.30957344k59.2262913177.07133107.94328235k59.2196782176.314894310.00000000k59.2092179175.364449012.58925412k59.1926904174.171586715.84893192k59.1666239172.677139219.95262315k59.125630017

34、0.810078925.11886432k59.0614410168.487628631.62277660k58.9616124165.618062239.81071706k58.8079502162.108567850.11872336k58.5750291157.881316863.09573445k58.2296995152.900153679.43282347k57.7330906147.2056929100.00000000k57.0465858140.9463836125.89254118k56.1414231134.3825597158.48931925k55.008092612

35、7.8448309199.52623150k53.6598515121.6565463251.18864315k52.1278794116.0600933316.22776602k50.4514403111.1833638398.10717055k48.6687302107.0501110501.18723363k46.8116340103.6130369630.95734448k44.9042636100.7879153794.32823472k42.963713398.47830631.00000000x41.001601696.58985101.25892541x39.025606395

36、.03686411.58489319x37.040706493.74427781.99526231x35.050077892.64714462.51188643x33.055710991.68901183.16227766x31.058809790.81986533.98107171x29.060036989.99395835.01187234x27.059655689.16763896.30957344x25.057584888.29718847.94328235x23.053379787.336634110.00000000x21.046139086.235489212.58925412x

37、19.034318284.936390715.84893192x17.015412383.372664119.95262315x14.985451981.465970225.11886432x12.938248279.124441131.62277660x10.864296176.242162939.81071706x8.749279572.701543750.11872336x6.572269968.381103563.09573445x4.303982563.171728679.43282347x1.906011157.0033388100.00000000x -667.5973074m4

38、9.8784239125.89254118x-3.465506141.8989529158.48931925x-6.532498433.2669243199.52623150x-9.906016624.2540763251.18864315x-13.620391015.1773493316.22776602x-17.71530726.4441015398.10717055x-22.2346991-1.3143724501.18723363x-27.2047219-7.1053656630.95734448x-32.5972523-9.5210330794.32823472x-38.276323

39、0-6.69802661.00000000g-43.85583993.4982024增益 59.2376212db帶寬125KHZGBW=1.14 X 10人8Bode圖如下:0LDO11lOGklECIDOlQfa皿KkiFjcgtric尸0篩忙硏ICO*lEFt equeuej=9. T3e+DT，衛(wèi) JlEdataH其實(shí)結(jié)果有可能更好，因?yàn)镻r aqiiezw:j-9_ 73e+0(J'Qedeltft-EQ二H h皿 ,相位裕度大約50°GBW和Cc、gm1的關(guān)系相對(duì)獨(dú)立，修改這兩個(gè)參數(shù)并不大規(guī)模影響電路的特性，由它們變化而產(chǎn)生的相位裕度的降低可以由Rz進(jìn)行補(bǔ)償。如果

40、耐心調(diào)試可以將GBW調(diào)整至10人92.7綜合仿真電路如下:仿真網(wǎng)表如下:*Two-Stage Op Amp.op ti on po st=2 nu mdgt=7 tnom=27.LIB "C:sy nop sysHs pice2005.03BINCMOS_035_S pi ce_Model.lib" tt電源電壓3v共模電壓1v交流電壓0.1vvi1 Vi1 0 dc=1 ac=0.1vdd VDD 0 3 vi2 Vi2 0 dc=1 ac=0r1 Vo R2 900r2 R2 0 100*cl Vo 0 3pfx1 VDD 0 Vi1 Vi2 Vo opamp .sub

41、ckt opamp VDD 0 Vi1 Vi2 V o M1 1 Vi1 3 3 p_33 W=57U L=1U M2 2 Vi2 3 3 p_33 W=57U L=1U M3 1 1 0 0 n_33 W=13U L=1UM4 2 1 0 0 n 33 W=13U L=1U900歐100歐負(fù)載開(kāi)路二級(jí)運(yùn)放子電路接口：VDD VSS 輸入1輸入2輸出補(bǔ)償電阻 補(bǔ)償電容 靜態(tài)偏置M6偏置380歐1pf200U600 U ( 3gm1=gm6)M6 Vo 2 0 0 n_33 W=38U L=1Urz 2 4 380 cc 4 Vo 1pfIrefl VDD 3 dc 200UIref2 VDD

42、Vo dc 600U .ends .op.ac dec 10 1 1Gvolt phase.print ac vdb(Vo) vp(V o) .endvovo1.0000000019.2671363179.99992041.2589254119.2671363179.99989981.5848931919.2671363179.99987381.9952623119.2671363179.99984112.5118864319.2671363179.99980003.1622776619.2671363179.99974823.9810717119.2671363179.99968305.01

43、18723419.2671363179.99960096.3095734419.2671363179.99949767.9432823519.2671363179.999367510.0000000019.2671363179.999203712.5892541219.2671363179.998997615.8489319219.2671363179.998738019.9526231519.2671363179.998411225.1188643219.2671363179.997999931.6227766019.2671363179.997482039.8107170619.26713

44、64179.996830050.1187233619.2671364179.996009263.0957344519.2671364179.994975979.4328234719.2671364179.9936750100.0000000019.2671364179.9920373125.8925411819.2671365179.9899756158.4893192519.2671366179.9873800199.5262315019.2671367179.9841123251.1886431519.2671360179.9799986316.2277660219.2671363179.

45、9748197398.1071705519.2671359179.9682999501.1872336319.2671348179.9600920630.9573444819.2671334179.9497588794.3282347219.2671317179.93675011.00000000k19.2671285179.92037301.25892541k19.2671235179.89975561.58489319k19.2671160179.87379991.99526231k19.2671039179.84112362.51188643k19.2670838179.7999868結(jié)

46、果如下：freq volt db3.16227766k19.2670535179.74819893.98107171k19.2670043179.68300245.01187234k19.2669270179.60092606.30957344k19.2668051179.49760047.94328235k19.2666101179.367525710.00000000k19.2663030179.203780812.58925412k19.2658145178.997656815.84893192k19.2650419178.738199419.95262315k19.2638168178

47、.411636125.11886432k19.2618761178.000665331.62277660k19.2588024177.483579139.81071706k19.2539348176.833194250.11872336k19.2462319176.015578963.09573445k19.2340519174.988589679.43282347k19.2148161173.7003021100.00000000k19.1845044172.0875676125.89254118k19.1368922170.0751921158.48931925k19.0624851167

48、.5767276199.52623150k18.9471082164.4986338251.18864315k18.7703037160.7504923316.22776602k18.5040467156.2644521398.10717055k18.1128890151.0253133501.18723363k17.5571661145.1062858630.95734448k16.8003691138.6938350794.32823472k15.8192737132.07764891.00000000x14.6119687125.59408491.25892541x13.19856951

49、19.54472281.58489319x11.6141082114.13324241.99526231x9.8983473109.44767172.51188643x8.0877540105.48099733.16227766x6.2116468102.16635883.98107171x4.291660299.40841335.01187234x2.342889397.10414836.30957344x375.4848459m95.15393757.94328235x-1.603886593.465863710.00000000x-3.590923991.956148012.58925412x-5.582889790.547521115.84893192x-7.578074289.166596519.95