[PDF]IMPEDANCE MATCHING NETWORKS

Some graphic and numerical methods of impedance |\9TvN^$`  
matching will be reviewed here. The examples given will refer TJ_=1Y@z  
to high frequency power amplifiers. <=um1P3X  
Although matching networks normally take the form of %&blJ6b  
filters and therefore are also useful to provide frequency C"pB"^0  
discrimination, this aspect will only be considered as a J%rP$O$  
corollary of the matching circuit. Qyh/ed/  
Matching is necessary for the best possible energy c0- ;VZ'  
transfer from stage to stage. In RF-power transistors the JAb6zpP  
input impedance is of low value, decreasing as the power Fd$!wBL  
increases, or as the chip size becomes larger. This 3'I^lc  
impedance must be matched either to a generator — of 2.I^Xf2  
generally 50 ohms internal impedance — or to a preceding qYB~VE03  
stage. Impedance transformation ratios of 10 or even 20 are lFG9=Wf  
not rare. Interstage matching has to be made between two kBWrqZ6  
complex impedances, which makes the design .. RYR-K^;R  
yt0,^*t_  

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