A laboratory exercise to improve student understanding of dominant pole analysis and high-frequency modeling of Field Effect Transistors

Abstract

In the quest for increased student understanding of the principles underlying high-frequency response of Field Effect Transistor amplifiers, a laboratory exercise employing a unique method to determine the intrinsic transistor model capacitances was used. The method employs two simple measurements: determination of the high 3-dB frequency for a common-source amplifier being driven by a Thévenin source with two different output resistance values. Circuit simulation results utilizing these experimentally determined intrinsic capacitances show much greater correlation to experimental results than those typically obtained using manufacturer-supplied values. Students participating in the laboratory exercise reported good gains in knowledge levels and reasonable gains in confidence levels.

Keywords

Assessment amplifier frequency response transistor modeling Miller's Theorem laboratory

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References

Schubert

Jr Kim

. Active and non-linear electronics, New York: John Wiley and Sons, 1996.

Costa

Liu

Harris

JJS

. Direct extraction of the AIGaAs.GaAS heterojunction bipolar transistor small-signal equivalent circuit. IEEE Trans Electronic Dev 1991; 38: 2018–2914.

Getreu

. Modeling the bipolar transistor, Amsterdam: Elsevier, 1978.

Spencer

Ghausi

. Introduction to electronic circuit design, Upper Saddle River: Prentice Hall, 2001.

Razavi

. Fundamentals of microelectronics, New York: John Wiley and Sons, 2008.

Hambley

. Electronics, 2nd ed. Upper Saddle River: Prentice Hall, 2000.

Sedra

Smith

. Microelectronic circuits, 4th ed. New York: Oxford University Press, 1998.

Sedra

Smith

. Mircroelectronic circuits, 3rd ed. New York: Saunders, 1991.

Schubert

Jr Kim

. A short study of the validity of Miller's theorem applied to transistor amplifier high-frequency performance. IEEE Trans Educ 2009; 52: 92–98.

10.

Kim EM and Schubert TF Jr. Using Miller's theorem and dominant poles to accurately determine Field Effect Transistor and bipolar junction transistor small-signal and SPICE capacitor values. In: Proceedings of the 2013 ASEE annual conference and exposition, Atlanta, 2013.

11.

Schubert

Jr Jacobitz

Kim

. Student perceptions and learning of the engineering design process: an assessment at the freshman level. Res Engg Design 2012; 23: 177–190.

12.

Schubert

Jr Jacobitz

Kim

. Exploring three-phase systems and synchronous motors: a low-voltage and low-cost experiment at the sophomore level. IEEE Trans Educ 2011; 54: 67–76.