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 R_in and output resistance R_o driven by a voltage source v_S(t) delivering its output to a load resistance of R_L.

Fig. 6.2-1 Voltage Amplifier with Load

Let P_in be the power drawn from the input source and P_L be the power delivered to the load resistance R_L. Then,

For practical values of the parameters (A_v >> 1, R_in >> R_L, R_o << R_L), this ratio will be >>1. Thus, the load gets much more power than what is drawn from the signal source. ...

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