le07 - 9/29/2009 E E 2315 Lecture 07 - Network Theorems,...

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9/29/2009 1 E E 2315 Lecture 07 - Network Theorems, Maximum Power Transfer Theorem • Given a Thévenin equivalent circuit of a network, the maximum power that can be transferred to an external load resistor is obtained if the load resistor equals the Thévenin resistance of the network. Any load resistor smaller or larger than the Thévenin resistance will receive less power. Maximum Power Demonstrated (1/2) V Th R Th R L a I Th Th L V I R R 2 LL PI R P L is max if and b  2 2 L LT h Th L R PV RR 0 L L dP dR 22 2 4 Th L L Th L Th L R R dP V dR R R
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9/29/2009 2 Maximum Power Demonstrated (2/2) and V Th R Th R L a I 0 L L dP dR LT h R R 2 Th L V P • Maximum Power Transfer Theorem applied when matching loads to output resistances of amplifiers • Efficiency is 50% at maximum power transfer b max 4 Th R Superposition Theorem (1/2) • In a linear system, the linear responses of linear independent sources can be combined in a linear manner.
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This note was uploaded on 02/20/2010 for the course EE 2315 taught by Professor Staff during the Fall '08 term at UT Arlington.

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le07 - 9/29/2009 E E 2315 Lecture 07 - Network Theorems,...

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