Electrical Engineering › Section P · Semiconductor theory, diodes, and transistors › Topic P.3
Inside BJTs, JFETs, MOSFETs, and thyristors
Add a third doped layer to a diode, or a control electrode beside a channel, and the junction stops being a one-way gate and becomes a valve that one terminal can open and close. This topic looks inside the four great device families to see how each one controls current.
In this topic
- From one junction to a controlled valve
- The bipolar junction transistor
- How the BJT controls current
- Alpha and beta
- Worked example: currents in an NPN
- NPN and PNP
- The junction field-effect transistor
- The MOSFET
- Worked example: charging a MOSFET gate
- Thyristors
- Common mistakes to avoid
- Key takeaways
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