[PDF]IMPEDANCE MATCHING NETWORKS

Some graphic and numerical methods of impedance "/zgh  
matching will be reviewed here. The examples given will refer qYA~Os1e  
to high frequency power amplifiers. Yg8*)u0  
Although matching networks normally take the form of ef`_ n+`  
filters and therefore are also useful to provide frequency n2K1X!E$  
discrimination, this aspect will only be considered as a B%8@yS  
corollary of the matching circuit. qzZ/%{Ak  
Matching is necessary for the best possible energy 712nD ?>  
transfer from stage to stage. In RF-power transistors the f'=u`*(b7  
input impedance is of low value, decreasing as the power M^Sa{S*?  
increases, or as the chip size becomes larger. This 3jAr"xc  
impedance must be matched either to a generator — of L?h?LZnq  
generally 50 ohms internal impedance — or to a preceding
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stage. Impedance transformation ratios of 10 or even 20 are Y%?S:&GH  
not rare. Interstage matching has to be made between two lbAhP+B  
complex impedances, which makes the design .. ~M}{rl.n=  
9f! M1  

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