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| MULTISTAGE DIFFERENTIAL AMPLIFIERS |
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Franclim F. Ferreira, Pedro Guedes de Oliveira, Vítor G. Tavares |
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Circuit Transformations Method - A Training Exercise |
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Suppose we want to evaluate the output resistance of the following CE intermediate stage of the AmpOp 741: |
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The 50k resistance refers to the previous stage output resistance and the transistor has
b = 200,
VA = 125 V and IC = 550 mA. Therefore, rp = 9.09 kW and ro = 227 kW. |
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First, we draw the small signals equivalent circuit. |
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