6-1 Parameters and con ns of two-pe Z,and z, are know. it 6-1 Parameters and connections of two-port network is easier for the 5.Connections of two-port network analysis of? (sEries connection (Series connection mpound two-p 2当则 工2=L2=I Z z=Za+Zb z=Za+Zb call it series connection 区2+乙) call it series connection I Parameters and connections of two-port network b-I Parameters and connections of two-port network Connections of two-port network(compound two-port Connections of two-port network (compound two-port) (1) The validity of Series connection D The validity of Series connection p::::h I=0 Zb If the Conditions of for the validity of Series connection It is not valid series connection But, this two-port network Za+zb -striHrarsttstuarammeter 6-1 Parameters and connections of two-port network 6-1 Parameters and connections of two-port network ort network(compound two-port) Connections of two-port network (compound two-port) (1 The validity of Series connection )The validity of Series connection Decision method: Z v90 Is Uz If V=v=0. the series connection is valid Series connection is not valid! ZA+zb北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 6-1 Parameters and connections of two-port network 5.Connections of two-port network (compound two-port) Za Zb - + V1a - + V2a + V1b + V2b - - - + V1 - + V2 Z ⎩ ⎨ ⎧ = + = + 2 2a 2b 1 1a 1b V V V V V V ⎩ ⎨ ⎧ = = = = 2 2a 2b 1 1a 1b I I I I I I ( ) ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ = ⋅ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ = + ⋅ 2 1 2 1 a b I I Z I I Z Z I1 I2 Z=Za +Zb call it series connection ⑴Series connection ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ +⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ =⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ 2b 1b 2a 1a 2 1 V V V V V V ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ +⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ = 2b 1b b 2a 1a a I I Z I I Z If Za and Zb are know, it is easier for the analysis of z. 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 5.Connections of two-port network (compound two-port) Za Zb - + V1a - + V2a + V1b + V2b - - - + V1 - + V2 Z I1 I2 Z1 Z3 Z4 Z2 e.g.: Z=Za +Zb call it series connection 6-1 Parameters and connections of two-port network ⑴Series connection 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 5.Connections of two-port network (compound two-port): ⑴ The validity of Series connection Conditions of port current for the validity of Series connection Za Zb - + V1a - + V2a + V1b + V2b - - - + V1 - + V2 Z I1 I2 Z=Za+Zb ? ⎧ == == ⎨ ⎩ == == 1 1a in 1a out 1b in 1b out 2 2a in 2a out 2b in 2b out II I I I II I I I Conditions of port current 6-1 Parameters and connections of two-port network 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 - + Z1 - + Z2 + Z4 Z + 3 - - - + - + I=0 If the Conditions of port current is false It is not valid series connection Z=Za+Zb e.g.: Conditions of port current: Z1 Z2 Z4 But, this two-port network still has its z-parameter. a b 5.Connections of two-port network (compound two-port): ⑴ The validity of Series connection 6-1 Parameters and connections of two-port network ⎧ == == ⎨ ⎩ == == 1 1a in 1a out 1b in 1b out 2 2a in 2a ou t 2b in 2b out II I I I II I I I 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 If Vp=Vq=0, the series connection is valid. Za - Zb + - + Vp + - Is Za - Zb + - + Vq + - Is Decision method: 5.Connections of two-port network (compound two-port): ⑴ The validity of Series connection 6-1 Parameters and connections of two-port network 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 北京大学 Z1 Z3 Z4 e.g.: Z2 Z5 Z6 Series connection is not valid! Z=Za+Zb Z1 Z3 Z4 Z2 Z5 Z6 V=0? test 5.Connections of two-port network (compound two-port): ⑴ The validity of Series connection 6-1 Parameters and connections of two-port network