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Unformatted text preview: esistance for the source. Maximum power transfer is desirable in the field of wireless communication where the power of the electric signal received by the antenna is not much and the only concern is to design the processing circuit such that the signal to noise ratio of the system is maximized by maximizing the power transfer at the carrier frequency by matching the load resistance (impedance) with that of the antenna. 56 EE1002 Introduction to Circuits and Systems Source loading It can be noted from the Thevenin equivalent circuit that the Thevenin resistance causes a voltage drop and the load sees a reduced voltage. The amount of voltage reduction depends on the load current, more the load current lesser is the voltage at the load. Rt Vt vL RL vL vT iL RT This phenomenon is called source loading. This is typical of practical voltage sources as most real‐life voltage sources like batteries can be more accurately modeled as an ideal voltage source in series with a resistance called as the internal resistance. The terminal voltage of the battery will be maximum when the load is zero or i...
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This document was uploaded on 01/20/2014.
- Winter '14