• B-C area small, small C.• B-E area small, small C.• Extrinsic base regions short

and heavily doped, reducing R.• Self-alignment allos reduction

of area, and reduction of base area.

• Oxide (SiO2) reduces base and emitter capacitance.

• Poly increases the β.

Double-poly Self-aligned BJT

ECL buffer/inverter

Course Outline

Review on Tuesday – Send me questions by e-mail and I will cover/answer in class.