Help for Smith V3.10 - Fritz Dellsperger
Help for Smith V3.10 - Fritz Dellsperger
Help for Smith V3.10 - Fritz Dellsperger
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2 2<br />
S 2<br />
L<br />
2<br />
SS11 21<br />
L<br />
2<br />
2<br />
1�� 1��<br />
GT� � S �<br />
1�� 1��<br />
�<br />
S S<br />
�<br />
12 21 S<br />
�2 � S22<br />
�<br />
1�S11�S<br />
For : Z � Z0 � Z ( � �0, � � 0)<br />
G L S L<br />
G � S<br />
TZo<br />
� �<br />
2<br />
21<br />
2<br />
21 21<br />
G dB �10log S �20logS<br />
TZo<br />
Operating Power Gain<br />
Z0<br />
Independent of S � (arbitrary � L with<br />
� �� )<br />
S<br />
*<br />
1<br />
Use “Operating Power Gain” <strong>for</strong> amplifier design with maximum output power, best<br />
efficiency or lowest intermodulation. Choose � L <strong>for</strong> maximum output power, best efficiency<br />
*<br />
or lowest intermodulation. Match input conjugately to resulting � 1 ( �S �� 1 ).<br />
G<br />
p<br />
S S<br />
�<br />
12 21 L<br />
�1 � S11�<br />
1�S22�<br />
L<br />
Power delivered to load PL<br />
� �<br />
Power input to network P<br />
Input<br />
matching<br />
network<br />
�S = �1*<br />
ZS = Z1*<br />
�1<br />
Z1<br />
1<br />
Transistor<br />
�S11 S12<br />
�<br />
� �<br />
�S S �<br />
� 21 22 �<br />
�2<br />
Z2<br />
�L<br />
ZL<br />
Output<br />
matching<br />
network<br />
Z0<br />
58
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