14.7. Output Resistance of the Feedback Amplifier and Effect on Gain from Loading
The output resistance of the resistance feedback amplifier was considered in Unit 11.4. There it was shown to be Ro = ro/(1 + T) [(11.12)], where ro is the output resistance of the open-loop amplifier and T is the loop gain of the feedback amplifier. Therefore, with the expectation that T >> 1, the output resistance of the feedback amplifier is very small. For example, consider the amplifier of Fig. 14.7, with no external load on the output and neglecting the effect of the feedback resistors. The open-loop output resistance is
Equation 14.36
The output resistance ...
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