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1、仅供个人参考混频器实验（虚拟实验）（一）二极管环形混频电路傅里叶分析得到的频谱图为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 題旦兰團國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：可以看出信号在900Hz和1100Hz有分量，与理论相符（二）三极管单平衡混频电路直流分析傅里叶分析 一个节点的傅里叶分析的频谱图为Grapher View_ 刖 熬FiJe Edit View Graph Trace Cursor Legend Tools Help色oI专誕哲e|ffiiy 01込)二人|題q甥画|巒轡c I a戶|处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)旧密Selected Trece；V(3两个节点输出电压的差值的傅里叶分析的频谱图为: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、：同样在1K的两侧有两个频率分量，900Hz和1100Hz 有源滤波器加入电路后UlF的傅里叶分析的频谱图为: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船书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)不得用于商业用途Selected DiagramFouri-er 代n 臼Uout节点的傅里叶分析的频谱图为:仅供个人参考File Edit View Graph T race Cursor Legend Tools Help诊叼|卑X毎噫|曲同阻區I込八人I題Q囿融巒右丨A艸I闪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 / >. *灵£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：加入滤波器后，会增加有（三）吉尔伯特单元混频电路2k和3k附近的频率分量直流分析Grapher View不得用于商业用途Fits Edit View Graph T ra« Cursor Lggend Tools Help色副专X翁鸟圈同眩吐| A二人逾 Q g曾巒觀甥I A y叫曲甑I巒艳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傅里叶分析一个节点的输出电压的傅里叶分析的参数结果与相应变量的频谱图如下: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两个节点输出电压的差值的傅里叶分析的参数结果与相应变量的频谱图为: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 画处翹| 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两侧都有频率分量，有IP3失真 将有源滤波器加入电路UlF的傅里叶分析的参数结果与相应变量的频谱图为:File Edit View Graph Trace Curoir L&g«nd Tools Help净IB |哼X喇唱|曲回!M目|込几人| Q ® 團愆衝0 |严|朋 DC Cv»ratr>g Pant | Fourier Analyas Fourltr Analysis Fou
13、峠r Anily&s Desig rdSOOn2tDri-1Q0n1k4k5kFourier Analysis2k3kFrequency (Hz)Selected RiagrjmzFourier AnalysisUout节点的傅里叶分析的参数结果与相应变量的频谱图为:Graphrer ViewFile Edit View Graph Tracs Cursor L 旳證 nd Tools Help3 191 *9 X嗨筑|曲直和P |还八人|Q画會魁归| 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：有源滤波器Uout节点的傅里叶分析的频谱相对于 Uif的傅里叶分析的频 谱来说，其他频率分量的影响更小，而且 Uout节点的输出下混频的频谱明显减 小了。输出的电压幅度有一定程度的下降。思考题（教材P116）:（1）比较在输入相同的本振信号与射频信号的情况下，三极管单平衡混频电路与吉尔伯特混频器两种混频器的仿真结果尤其是傅里叶分析结果的差异，分析其中的原 因。若将本振信号都设为1MHz
15、,射频频率设为200kHz,结果有何变化，分析原因答：三极管Fourier AnalysisDesign2.91Frequency (Hz)Selected Trace:V(3-V(6)吉尔伯特(2)对图18中加入的有源滤波器的特性进行分析，对其幅频特性、相频特性进行 仿真。若要使得滤波器的带宽减小20%，应对滤波器元件参数如何调整。将调整带宽后的滤波器与混频器相连，比较前后傅里叶分析的结果异同，分析原因。仅供个人参考答:对有源滤波器进行仿真结果如下弓 ru-UMrrs不得用于商业用途Frequency (Hz)根据增益带宽积不变原则，弱带宽减少20%，则增益变为原先的125%，故可将运放处的
16、反馈电阻由76K变为95K。改变后傅里叶分析结果如下：Founeralvsis甌ODtl眦伽伽Don。伽6 5 4 _3 Ti 1- 11 >二罗0>5k改变前傅里叶分析结果如下:Fourier AnalysisSOOtil 400n- 3OQti- 200n - lOQn0 - -10Qnlk2k3kFrequency iHzj仅供个人用于学习、研究；不得用于商业用途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员bko gA.nrogeHKO TOpMenob3ymoiflCH6yHeHuac egoB u HHuefigoHMucno 员 B30BaTbCEb KOMMepqeckuxqe 员 ex.以下无正文仅供个人用于学习、研究；不得用于商业用途For personal use only
18、in study and research; not for commercial use.Nur f u r den pers?nlichen f u r Studien, Forschung, zu kommerziellen Zwecken verwendet werden.Pour l ' e tude et la recherche uniquementa des fins personnelles; pasa des fins commerciales.to员bko gA.nrogeHKO TOpMenob3ymm0ai6yHeHuac egoB u HHue肉go 员冶hbiucno 员 B30BaTbCEb KOMMepqeckuxqe 员 ex.以下无正文