Electrical Engineering › Section P · Semiconductor theory, diodes, and transistors › Topic P.9
Common-emitter, common-collector, common-base, and cascode amplifiers
A single BJT can amplify in three basic ways, depending on which terminal the input and output share. Each gives a different mix of voltage gain, current gain and impedance, and two of them stack into the cascode, an amplifier built for speed.
In this topic
- Three ways to connect one transistor
- Bias first, then signal
- The common-emitter amplifier
- Worked example: a common-emitter stage
- The common-collector amplifier
- Worked example: a follower as a buffer
- Darlingtons and follower regulators
- The common-base amplifier
- The cascode and the Miller effect
- Choosing a configuration
- Common mistakes to avoid
- Key takeaways
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