Electrical Engineering › Section P · Semiconductor theory, diodes, and transistors › Topic P.10
Biasing techniques, biasing calculations, and coupling
An amplifier is only as good as its operating point. This topic shows how a few resistors set that point and keep it steady while β varies threefold, and how signals are coupled in and out without disturbing it.
In this topic
- Why bias needs a circuit
- Classes of operation
- The dc load line
- Worked example: base bias versus collector feedback
- Voltage-divider bias
- Worked example: a divider-biased stage
- Bypassing the emitter resistor
- Capacitor coupling
- Worked example: sizing a coupling capacitor
- Direct and transformer coupling
- Common mistakes to avoid
- Key takeaways
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