输入阻抗
电路的输入阻抗（英語：）是指电路从输入功率源方向“看进”电路时所等效的阻抗。如果功率源提供了已知的电压和电流，这阻抗可以通过欧姆定律求得。输入阻抗是电路的戴维寧等效，其模型是一个RL（电阻-电感）或RC（电阻-电容）组合，得到的等效电路能与原电路对外产生相同的响应效果。
简单的功率输入输出电路模型：ZS是负载端看进电路的阻抗，而ZL是功率输入端看进去的阻抗。
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参考文献
- The Art of Electronics, Winfield Hill, Paul Horowitz, Cambridge University Press, ISBN 0-521-37095-7
- "Aortic input impedance in normal man: relationship to pressure wave forms", JP Murgo, N Westerhof, JP Giolma, SA Altobelli pdf （页面存档备份，存于）
- An excellent introduction to the importance of impedance and impedance matching can be found in A practical introduction to electronic circuits, M H Jones, Cambridge University Press, ISBN 0-521-31312-0
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