ElectronicsI_L28 - Lecture 28 Common Base Amp. We can now...

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Lecture 28
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Common Base Amp. We can now look at another amplifier configuration called the common base. Here the base is grounded, which we have seen before. A signal is passed to the BJT by modulating the emitter bias (note where the signal is inserted). The output is still taken at the collector. You can see that the base is now the common terminal between the input and output. This amplifier makes for a good current buffer, which has applications in impedance matching
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CG Equivalent Circuit We will again reduce this circuit to the equivalent small-signal circuit. The BJT is replaced by the T- model as shown The capacitors and power supplies are likewise removed Now note that we don’t have the bypass capacitor as we did with the CE configuration. Why? We don’t need it. – It was there to ensure continuity for the signal – Here, the signal source is attached to the emitter, thus we don’t need to worry about continuity through the current bias source.
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Analysis • We are again ignoring Early effect because it
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ElectronicsI_L28 - Lecture 28 Common Base Amp. We can now...

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