放大电路的频率响应习题及解答

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1A.B.C.2A.B.C.D.3fLfHA.0.5B.0.7C.0.9A.3dBB.4dBC.5dB4ffLUo&iU&A.45˚B.90˚C.135˚ffHUo&iU&A.45˚B.135˚C.225˚1A2BA3BA4CC1T5.2VCC12VC4pFfT=50MHz100,β'bbr0801smuA&2'πC3fHfL4T5.21178)(mA/V2.69k27.1k27.1k17.1mV26)1(V3mA8.1)1(Aµ6.22cmbeeb'isismTEQmbbeieb'bb'beEQeb'cCQCCCEQBQEQbBEQCCBQ−≈−⋅+=≈=Ω≈=Ω≈+=Ω≈+=≈−=≈+=≈−=RgrrRRRAUIgRrRrrrIrRIVUIIRUVIu&ββ2C'π2pF1602)1(pF2142)(2cm'Teb'0eb'0T≈++=≈−≈+≈CRgCCCfrCCrfπππβCβ3Hz14)(21kHz17521567)()(isL'Hsbb'eb'bsbb'eb'≈+=≈=Ω≈+≈+=CRRfRCfRrrRRrrR4dB45lg20sm≈uA&T5.2T5.2T5.33120lg||muA&dBmuA&2fLHzfHkHz.3uA&T5.3160104210103)10j1)(10j1)(10j1(j100)10j1)(10j1)(j101(1054543fffffff+++±+++±45.1P5.1C'bbrCRirbeP5.11fLRsfLfL2b-eCf'πHRsfHRbgmC'πfH:11bebs)(π21CrRR+2'sbbb'eb')]([21ππCRRrr+55.2P5.2uA&P5.2:)10j1)(10j1(3.2j)10j1)(j101(3255fffAffAuu++−≈++−≈&&5.3P5.3uA&P5.340dB1001Hz10Hz250kHzuA&6)105.2j1)(10j1)(j1(10)105.2j1)(j101)(j11(100525×++++=×+++−=ffffAfffAuu&&5.4P5.4123f104Hzf105:102P5.460dB/3f104Hz'135of105Hz'270o5.5P5.4fuA&HuA&kHz2.531.1)10j1(10'HH343≈≈+±=fffAu&75.6)10j1)(10j1(j105fffAu++−=&1fmuA&LfH?21fmuA&LfHHz10Hz10100)10j1)(10j1(10j1005HLm5==−=++⋅−=ffAfffAuu&&2P5.6P5.65.78105.2j110j15j1j20054×+++⋅=ffffAu&1fmuA&LfH?21fmuA&LfHHz10Hz510)105.2j1)(10j1)(5j1(5j104HL3m543≈==×+++⋅=ffAffffAuu&&2P5.7P5.795.8P5.8βC'bbrIEQP5.81;2;3;1a2c3c5.9P5.8aβ100rbe1kC1C2Ce100FfL?CeCeHz80π212011eLsbebsbee≈≈Ω≈++≈++=RCfRrRRrRRββ105.10P5.8b,C1C2,rbe=1kC1:C2?C1C225msC1C2fL?1C1:C2C1RsRiC2RcRLC1:C25:12C1C2Hz1021.1Hz4.621F5.2F5.12L1LL2L1Lc2is1≈≈≈==≈+=≈+=ffffRRCRRCτττ5.11P5.8aCefsmuA&HfLsmuA&Ui&bI&cI&oU&fLfHCf'C'H5.12P5.8aC1CeC2Ceβ100rbe1kfL60HzCeCeeLπ21RCf≈RCeRCeΩ≈++≈++=2011sbebsbeeββRrRRrRR11133π21Le≈≈RfCF5.13P5.8d100r'bbrbe1kIEQ2mAC800pFR'πs2kRb500kRC3.3kC=10FfHfL1fLHz3.5)(21)(21besisL≈+≈+=rRRRf2fHdB6.37lg2076)()(V/mA77kHz316)]([π21)]([π21k9.0sm'Lmbeseb''Lmbeeb'isismTEQm'πsbb'eb''πsbbb'eb'Hbb'beeb'≈−≈−⋅+≈−⋅⋅+=≈≈≈+≈+=Ω=−=uuARgrRrRgrrRRRAUIgCRrrCRRrrfrrr&&P5.65.14P5.14CgsCgd5pFgm5mSC1C2CS10FfHfLsuA&P5.1412fHfLsuA&)101.1j1)(16j1()16j(4.12MHz1.1π21)π(21pF72)1(Hz16π214.12)(6s'gss'gsgsHgd'Lmgs'gsssL'Lm'Lmisism×++⋅−≈≈≈=≈++=≈≈−≈−≈−+=fffACRCRRfCRgCCCRfRgRgRRRAuu&&5.155.4.7aRg2MRdRL10kC10FCgsCgd4pFgm4mSHz90421Hz796.0)(21pF88)1(dB26lg20,20'gsgHLdLgd'Lmgs'gsm'Lmm≈=≈+≈=++=≈−=−=CRfCRRfCRgCCARgAuu&&P5.6135.16++−==++−==52o25o1110j150j1j210j14j1j25fffUUAfffUUAiuiu&&&&&&12fLfH3125221)10j1)(50j1)(4j1(50ffffAAAuuu+++−==&&&2fLfHkHz3.641021.111Hz50H5HL≈≈≈fff310480dBP5.16P5.16145.17P5.1712T1T2r'bbs214321'πCP5.171Ce2'CRRRRR'C155.18P5.2dB60lgm=uA&2010Hz40dB/105Hz40dB/f10Hz90of105Hz90oP5.18P5.1816

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