混頻器試驗報告

1、僅供個人參考混頻器實驗（虛擬實驗）（一）二極管環(huán)形混頻電路傅里葉分析得到的頻譜圖為For pers onal use only in study and research; not for commercial useGrapher ViewFile Edit View Graph Trace Cursor Legend Took Help&X踰E饉IH越旺 0A A 題旦蘭團國0 A 3 討Foirlef Anysi5 Fdurisr Aralysts jDesign2.8component:id sizer2.4769e-0081.26269s+005 %10247 ->8&

2、gt;9oaFourier Analysis125.0000m J-25.0000m -Ik2k3kFrequency Hz）4kSelfirrted Trace：Vf5分析：可以看出信號在900Hz和1100Hz有分量，與理論相符（二）三極管單平衡混頻電路直流分析傅里葉分析 一個節(jié)點的傅里葉分析的頻譜圖為Grapher View_ 刖 熬FiJe Edit View Graph Trace Cursor Legend Tools Help色oI專誕哲e|ffiiy 01込)二人|題q甥畫|巒轡c I a戶|處g>'s _Fourier Analysis | Founer Ana

3、lysis : DC Operatng Point Fourier AnalysisDesign2,91Fourier Analysis6D0n t 土 -100n :k丨 I l匡ii i a I ii &】直“ 血、2A DIk2k3k4k&kFrequency (Hz)舊密Selected Trece；V(3兩個節(jié)點輸出電壓的差值的傅里葉分析的頻譜圖為:File Edit View Graph Trace Cursor Legend Tools Help色 j x 瞻n 込二 a 直 g 團宴 e a sk o Fourier 4naiysi& Founer An

4、alys DC Operating Point Foirier Anaiysis Fouisr AnalysisDesign2.911 Fourier analysis for VfS-V (6J):2 DC componentt3 No. Harmonics： T THU;5 Grid sizer6 Interpolation Degree:4.6934-010OW79.09 %1024V £ J o>1.25p-250.00n1kFourier Analysis2k3kFrequency (Hz)4k5kSslectpd Disgram:Fourier Analysis分析

5、：同樣在1K的兩側有兩個頻率分量，900Hz和1100Hz 有源濾波器加入電路后UlF的傅里葉分析的頻譜圖為:Grapher ViewFile Edit View Graph Trace Cursor Legend Tools Help3 屹X薦験目込|二人題旦逬壓魏讎也a .艸計tQ醪Fourier 姑*¥弘FOuritr Analysis D亡 Opcrifang Ptunl | Ffluritr Analysis 1 Fouier Ana./SiS Fmjricr AnalysisDesign2.916028船書40Fourier analysis for V(3-V(6):D

6、C co呻orient:No. Harmonics:TH):Grid size:Interpolation Degree:9360.12%10247>)&eloAFourier Analysis1.251-25000n0Ik-k4k2k3kFrequency (Hz)不得用于商業(yè)用途Selected DiagramFouri-er 代n 臼Uout節(jié)點的傅里葉分析的頻譜圖為:僅供個人參考File Edit View Graph T race Cursor Legend Tools Help診叼|卑X毎噫|曲同阻區(qū)I込八人I題Q囿融巒右丨A艸I閃K>|霜lFourier An

7、alyse | Fourier Analysis DC Operating Point | Fourier Analysis Fcm扈Analysts | Fourief Analysis Fourier Anals 甩叵1Fourier Analysis200nl亠一 -1 / >. *靈£一 -一 JL.-A-or®-11ii>)s>eloADesign2.91iia_i1Fourier analyse for V(12):2DC component:1.42757e-O093NoP Harmonics:40TTC:5S7B.01%5Grid size

8、:1024Interpdafcn Degree:1701k2k3k5kFrequency (Hz)Trace: V(12分析：加入濾波器后，會增加有（三）吉爾伯特單元混頻電路2k和3k附近的頻率分量直流分析Grapher View不得用于商業(yè)用途Fits Edit View Graph T ra« Cursor Lggend Tools Help色副專X翁鳥圈同眩吐| A二人逾 Q g曾巒觀甥I A y叫曲甑I巒艷X Ct>erating Rgint DesignlDC Operating PointDC Operating Point800,49303m 17.92769 m

9、 5.00M02.781172.0 5.000002.781172.0 388.18859 m 3S8s1S859m 5.00000 0,00000 0.00000-4-19951merecrea Uiagram.：UL. Uperaiing roim傅里葉分析一個節(jié)點的輸出電壓的傅里葉分析的參數(shù)結果與相應變量的頻譜圖如下:Grapher ViewFile Edit View Graph Trare Cursor Legend Tools HelpDesign!睜另| *9 X血團曲固竝 |込八人|題Q越團瞰翻右A ! J沖R>|檎越j»li11Fourier analyss

10、for V9):2DC companent:53No. Harmonics:40斗THD:2462.55%5Grid size:10246Interpolation Degree:17DCOperamg Point Fourier Analysis I2k3kFrequency (Hz)Fourier AnalysisLa L1JLt LJ+ n J*d-Ld-L L-Ji-t£I日250n1Q0n50nQSelected DiagrarnFouner Analysis兩個節(jié)點輸出電壓的差值的傅里葉分析的參數(shù)結果與相應變量的頻譜圖為:Grapher* ViewFile Edit Vi

11、ew Graph T race Cursor Legend Tools Help戲引I勺k麻© i曲同阻呂|込八人i愆q 畫處翹| a刑妙aj膛)硬 DC Operstng Point Fourier AnalysisAnalysis |Designl(>8>45oa500n-200n- -100n：IkFourier Analysish i 1 1 tL I *2k3kFrequency (Hz)4kEk1 1 1TFcuriff anal/sis for V(5-V(1L)TDC component；L.2235e-0i7VNo. Hafmonics:40TWt243

12、5.87%5Grid size:1024VInterpolatMin Degree:tYSelected Diagram:Fourier Analysis分析：1k和3k兩側都有頻率分量，有IP3失真 將有源濾波器加入電路UlF的傅里葉分析的參數(shù)結果與相應變量的頻譜圖為:File Edit View Graph Trace Curoir L&g«nd Tools Help凈IB |哼X喇唱|曲回!M目|込幾人| Q ® 團愆衝0 |嚴|朋 DC Cv»ratr>g Pant | Fourier Analyas Fourltr Analysis Fou

13、峠r Anily&s Desig rdSOOn2tDri-1Q0n1k4k5kFourier Analysis2k3kFrequency (Hz)Selected RiagrjmzFourier AnalysisUout節(jié)點的傅里葉分析的參數(shù)結果與相應變量的頻譜圖為:Graphrer ViewFile Edit View Graph Tracs Cursor L 旳證 nd Tools Help3 191 *9 X嗨筑|曲直和P |還八人|Q畫會魁歸| A叟叫艸b|檎<8DC Operafang Pant Fauier Ardyss Fourie- Andsis I f=uer

14、Analyss Fouritr Aruiy$it |Designlss>ejo>00soFourier Analysis承3kFrequency (Hz)Selected Trace；V(10J分析：有源濾波器Uout節(jié)點的傅里葉分析的頻譜相對于 Uif的傅里葉分析的頻 譜來說，其他頻率分量的影響更小，而且 Uout節(jié)點的輸出下混頻的頻譜明顯減 小了。輸出的電壓幅度有一定程度的下降。思考題（教材P116）:（1）比較在輸入相同的本振信號與射頻信號的情況下，三極管單平衡混頻電路與吉爾伯特混頻器兩種混頻器的仿真結果尤其是傅里葉分析結果的差異，分析其中的原 因。若將本振信號都設為1MHz

15、,射頻頻率設為200kHz,結果有何變化，分析原因答：三極管Fourier AnalysisDesign2.91Frequency (Hz)Selected Trace:V(3-V(6)吉爾伯特(2)對圖18中加入的有源濾波器的特性進行分析，對其幅頻特性、相頻特性進行 仿真。若要使得濾波器的帶寬減小20%，應對濾波器元件參數(shù)如何調整。將調整帶寬后的濾波器與混頻器相連，比較前后傅里葉分析的結果異同，分析原因。僅供個人參考答:對有源濾波器進行仿真結果如下弓 ru-UMrrs不得用于商業(yè)用途Frequency (Hz)根據增益帶寬積不變原則，弱帶寬減少20%，則增益變?yōu)樵鹊?25%，故可將運放處的

16、反饋電阻由76K變?yōu)?5K。改變后傅里葉分析結果如下：Founeralvsis甌ODtl眥伽伽Don。伽6 5 4 _3 Ti 1- 11 >二羅0>5k改變前傅里葉分析結果如下:Fourier AnalysisSOOtil 400n- 3OQti- 200n - lOQn0 - -10Qnlk2k3kFrequency iHzj僅供個人用于學習、研究；不得用于商業(yè)用途For personal use only in study and research; not for commercial use.Nur f u r den pers?nlichen f u r Studien

17、, Forschung, zu kommerziellen Zwecken verwendet werden.Pour l ' e tude et la recherche uniquementa des fins personnelles; pasa des fins commerciales.to員bko gA.nrogeHKO TOpMenob3ymoiflCH6yHeHuac egoB u HHuefigoHMucno 員 B30BaTbCEb KOMMepqeckuxqe 員 ex.以下無正文僅供個人用于學習、研究；不得用于商業(yè)用途For personal use only in study and research; not for commercial use.Nur f u r den pers?nlichen