ElectronicsI_L16 - Lecture 16 The Source Resistance We...

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Lecture 16
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The Source Resistance We covered the uses of adding a source resistance before. Now we will consider it’s effect on the small signal amplifier. When we treat the equivalent circuit, we will not include r o . If we did, there would be a direct connection between the output and the input. •H o w ? –R S is part of a feedback loop to the gate, meaning it influences the input signal as seen by the FET. o would offer a way for the output to bypass the FET and directly couple to R S leading to a feedback between the output and input – This would create a non-unilateral amplifier. This occurs often in the integrated circuits, but not so much in discrete components.
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Equivalent Circuit This time, we’ll try substituting the FET with the T-model. This can save time in evaluating the circuit. Again, if R G is large, then we can expect only a small voltage loss from the divider composed of R sig and R G But, we now have another voltage divider, composed of 1/g m and R S . This might
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ElectronicsI_L16 - Lecture 16 The Source Resistance We...

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