高频电子线路_第二章

1、 ILVRVCVSVSV L R 电感线圈等效为电感电感线圈等效为电感L L和损耗电和损耗电阻阻R R的串联；的串联； C R w wX ILVRVCVSVjZRX1j()RLCwwOLw1LCww1Cw22IZRX最小，最大0w00Xw w0=w？0f fZR ILVRVCVSV001=0LCww01=LCw01=2fLC0SmaxVIIR ILVRVCVSV0f fZR0SmaxVIIR00000SLSSVLVI jLjLjVjQVRRwww000011CSSVIjVjQVjCCRww001LQRCRww ILVRVCVSV0w)()()(.0wwwIINRVCLRVss)1j(ww)1(

2、CLRRwwj)(j00)() (j11wwwwwweNQ)(11000wwwww jRL20020) (11)()()(wwwwwwwQIIN0www00000002020022wwwwwwwwwwwwwwwwwwwww0ww在附近2202002011211) (11)()()(wwwwwwwwwQQIIN22=00fQQfww20( )1()1IIww12半功率点1210027.0 )()(2wwwwwww127.02fff或1002wwwQ120022wwwQ120011wwwQQ0702ww0072ffQ2111) (11)0()()(22002wwwwQIINRs+CVsRLLRLS

3、0RRRLQLwRRRRQLS01)(j000)() ( j11)()()(.wwwwwwwwweNQIINwwww arctanarctan00Qwwww arctanarctan00Qwwww arctanarctan00Q Is C L R 回路的总阻抗回路的总阻抗CLRCLRZwwwwj1jj1jCLRCLRwwww1jj1jCLRCLww1jLCLCRww1j1LRw Is C L R 11jZCRCLLwwLCLCRBGYww1jj1,0PPPBCLwwww Is C L 1/G Bw wO电纳电纳wCB =wC 1wL1Lw感性感性容性容性wPpwOwY ；CRLGR1p当信号源

4、为电流源时，回路电压当信号源为电流源时，回路电压最大，即最大，即pspRIVLC1pwLCf21pCLLLCCLpp11wwRCLRCRRLQpppww11LQLRLRLCLRLCRLRppppppwwww222CRLGRpp1)(RL wspppsppsppocpIjQCQICjRICjCjVIwwww1sppppsppspopoLpIjQLjLQILjRILjVRLjVIwwwww 2211wwwwwpppQN)1j()1j()()()(.pppsps0LCGGGLCGIVVNwwwwwwwI 22221121111wwwwwwwpppppQQNppQww22220111111VVwwww

5、wwwwwwwwwwwwwwwwpppppppppppppppQjQjQjQjQwwwwarctanarctanpppQ212111211220wwppQVV1ppppQQwwwww7 .0122ppQwwww127 . 02ppQff7 . 02IsCLRsRpRLLsppL1GGGLQwLpspppRRRRRL11wLpsppRRRRQ1 ppppssjjjXRXRXRppppppppjjjjXRXRXRXR2p2pp2p2p2p2ppjXRXRXRXRppppssjjjXRXRXR2p2pp2p2p2p2ppjXRXRXRXR2p2p2ppXRXRRs2p2pp2psXRXRXSSSPR

6、XRR22SSSXXRX22P2S1LPQRRPLLXQQX22S1s2Lp1RQR2Lsp11QXXLQXRQRXQpp2Lss1Ls2Lp1RQR2Lsp11QXX21LspQRR spXX 当品质因数足够高时当品质因数足够高时1）小的串联电阻变为大的并联电阻。小的串联电阻变为大的并联电阻。2）串联电抗变为同性质的并联电抗。串联电抗变为同性质的并联电抗。222111,jXRZjXRZ2211,RXRX021 XX2122122121212121212211212121)(RRXRRXRRXXRRjXjXXXjRRjXRjXRZZZZZp222111,jXRZjXRZ221212)(1)CR

7、RRRLZPppww（2122122121212121212211212121)(RRXRRXRRXXRRjXjXXXjRRjXRjXRZZZZZp21111LLLLLLLpwwMLLMLp2211211NNNp2121212RRLRRXZpabw211211LLLLLLLLp222122212122121pZpRRLLLRRLRRLZbdpppabwww2pZZdbabpLLLVVLRdbab2111w1pdbabZZ21 p2p2121CCCCC电路总电容：2121212111111CCCCCCCCCCCCpww总电抗部分电抗12NNp L2L221L1RpRNNRLLLLLp2212L2

8、L1RpR电容抽头电路电容抽头电路 C2 RL P L R L C b) a) C1 V VL + - + - 211pCCCL21RpRL CL C RL P C L L R L C d d b b a L21RpRLL2LCpC Is C Rs RL a b d I s R s d b C L RL s2s1RpRsspIIpuuss221112XXXk 耦合回路的公共电抗（或电阻）绝对值与初、次级耦合回路的公共电抗（或电阻）绝对值与初、次级回路中同性质的电抗（或电阻）的几何中项之比回路中同性质的电抗（或电阻）的几何中项之比1V1Z2Z1I2I1L2LabdcM1111CjRZw2221C

9、jRZw12221222211121111)()(0)()(IMjZIMjILjZIIMjZIMjILjZIVwwwwww11111111jXRLjZZw22222222jXRLjZZw2221111ZMZVIw112221112212ZMZZVMjZIMjIwww2221111ZMZVIw1V1Z1I1Lab1222fZZMw11Z11222222222222222222222222221fffjXRXXRMjRXRMjXRMZMZwwww22222222211222222222111XXRMXjRXRMRZeww11111111jXRLjZZw22222222jXRLjZZw1IMjw2I

10、cd2Z2L11222111ZMZZVMjww111ZVMjw2Icd2Z2L1122ZMZfw2212ZIMjIw22211211211211211211112112211fffjXRXXRMjRXRMjXRMZMZwwww11211211222112112112222XXRMXjRXRMRZewwwww2121,00201212121,QQQGGGCCCLLL设MMMoooMMMsCjVjGVCjVjQGVCjVCLLGjGVCCCCjVCjVLjVGVCjVVCjVLjVGVIwwwwwwwwwwwwwwwwww212001211211111211111111111)(：MCjVVCjV

11、LjVGVwww12222220MCjVjGVw1210MMsCjVjGVCjVjGVIww1221)1 (0)1 (22222222241wwGCGICVVMsmMwwww2112222222222jGCGICjCjGICjVMMsMsM22222222241wwGCGICVVMsmMKQCCCCCGCCCCGCCCGCGCMMMMMM21wwww设：2222241GIVsm。2222241GIVsm达到最大时，可知，当201VGIVsm2max2422222422222222max22121241212412VV121424max2VVQff07 . 02222207 . 0ffQ11,11202），在峰点（1。，两个峰点的位置拉开随着21121242222112128121222242222（舍去），在谷点：令0119. 01 . 36081. 9141. 2241. 241. 2211202211 . 3207 . 0ffQQff07 . 01 . 321。求导，并令其等于对0两峰点位置：4222212120)1 (2211022210kff01ckk5 . 1一般采用一般采用 稍大于稍大于1 1，这时在，这时在通带内放大均匀，而在通带通带内放大均匀，而在通带外衰减很大