SubThreshold.com
A central location for SubThreshold design information.

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BJT? What is that doing here? Well everyonce in a while you have to deal with them too. It is rare enough that we usually forget some of the basics, so it helps to have some good resources available.

Keeping the symbols straight:

Just remember NPN stands for "Nothing Points iN"

Equations

NPN

• Collector current:

Symbols

g_m

Transconductance

V_BE(on)

Base Emitter on voltage (for active region) - typically about 0.6V

V_CE(on)

Collector Emitter on voltage (for active region) - typically about 0.2V

V_T

Thermal Voltage

Links

• PNP & NPN Curves - Almost all you need to know.
• Basic Amplifier Configurations
• Pspice Example
• BJT Lessons - Transfer curves, circuits, etc.
• Transistor models (PDF)

Backrefs: