September 2008
Beginner
834 pages
37h 13m
English
Content preview from Electric Circuits and Networks
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6.2 THE ROLE OF DC POWER SUPPLY IN AMPLIFIERS
Figure 6.2-1 shows a voltage amplifier with input resistance Rin and output resistance Ro driven by a voltage source vS(t) delivering its output to a load resistance of RL.
Fig. 6.2-1 Voltage Amplifier with Load
Let Pin be the power drawn from the input source and PL be the power delivered to the load resistance RL. Then,
For practical values of the parameters (Av >> 1, Rin >> RL, Ro << RL), this ratio will be >>1. Thus, the load gets much more power than what is drawn from the signal source. ...
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