●●● 2.BJT N发射☒ P基区 ①Current drive.电流器件 N集电区 2 Silicon,below 2~4GHz,larger N村底 transconductance夸导，high gain,low-cost. 发积 limited by base length由基极长度限 制，0.1m A common-emitter configuration R(基极电阻)=7D ④Biasing Point偏置点：depends on the R(等效元电阻)=110D Cπ（等效π电容）=18pF application and the type of transistor C.(集电极电容)=18pF 依赖于应用和晶体管的类型 gm(跨导)=900mS 5 DC biased:single supply 12
2. BJT ③ limited by base length由基极长度限 制, 0.1m ① Current drive.电流器件 ② Silicon, below 2~4GHz, larger transconductance夸导, high gain, low-cost. ④ Biasing Point偏置点: depends on the application and the type of transistor 依赖于应用和晶体管的类型 ⑤ DC biased: single supply 2 m T g f C 金属电极 B E B P+ P N + +发射区 P 基区 N+衬底 C N 集电区 A common-emitter configuration 12
●●● ●●●● ●●●●● 6.2 Two-port Power Gains ●●●0 ●●●●0 ●●●0 ●●●● 2, ● i [S] i-明 (Z) 0M-: T,= Zs-Zo ZL-Zo Zs+Zo ZL+Zo S2STL S2S2「s 1-S2T w 1-SuTs B-r.--r.) 13
§6.2 Two-port Power Gains 13 0 L 0 L L Z Z Z Z 0 0 S s S Z Z Z Z 12 21 22 11 1 S out S S S S S 12 21 11 22 1 L in L S S S S 2 2 1 0 |V | 1 2Z Pin in 2 2 2 0 1 2 L L V P Z
●●】 ●●●● ●●●● 1.Power gain ●●●● ●●●● g= BIsal a-ir) ●●●● ●●●色 P 1-S2ra-) n=S+SoSat ●● 1-S22TL The ratio of power dissipated in the load Z to the power delivered to the input of the two-port network. 负载上吸收的功率与传输到二端口网络输入端口的功率之比 2.Available Gain P P. Saa-rs) S2S2「s Pants-F 1-SIs(1-Tom) 1-Surs The ratio of the power available from the two-port network to the power available from the source. 能够从二端口网络得到的功率与能够从源得到的功率之比 Assuming conjugate matching of both the source and the load,depending on Zs but not Z假定源和负载都共轭匹 配 14
1. Power gain The ratio of power dissipated in the load ZL to the power delivered to the input of the two-port network. 负载上吸收的功率与传输到二端口网络输入端口的功率之比 2. Available Gain The ratio of the power available from the two-port network to the power available from the source. 能够从二端口网络得到的功率与能够从源得到的功率之比 Assuming conjugate matching of both the source and the load, depending on ZS but not ZL假定源和负载都共轭匹 配 * * 2 2 21 2 2 11 (1 ) 1 (1 ) L out S in L avn S A avs in S out P P S G P P S 2 2 21 2 2 22 in (1 ) 1 (1 ) L L in L P S G P S 14 12 21 11 22 1 L in L S S S S 12 21 22 11 1 S out S S S S S