A unified model for single/multifinger HBTs including self-heating effects

Author

Garlapati, Akhil ; Prasad, Sheila

Author_Institution

Dept. of Electr. & Comput. Eng., Northeastern Univ., Boston, MA, USA

Volume

49

Issue

1

fYear

2001

fDate

1/1/2001 12:00:00 AM

Firstpage

186

Lastpage

191

Abstract

This paper presents a unified analytical large-signal model that includes self-heating effects. The model is applied to a single-finger AlGaAs/GaAs heterojunction bipolar transistor (HBT) and a multifinger InGaAs/GaAs HBT. The self-heating effect in the HBT is simulated as a feedback from the collector current to the base-emitter voltage. The main advantage of the circuit presented here is that additional analysis of coupling between electrical and thermal circuits is not required, as is the case with the existing models. The small-signal HBT model is implemented based on the S-parameters at multiple frequencies measured at multiple bias points. This model is verified by comparing the measured and simulated S-parameters. The large-signal model is based on the forward Gummel plot and is built over the small-signal model. This model is verified by comparing the simulated and measured dc I-V characteristics

Keywords

III-V semiconductors; S-parameters; aluminium compounds; gallium arsenide; heterojunction bipolar transistors; indium compounds; microwave bipolar transistors; semiconductor device models; AlGaAs-GaAs; InGaAs-GaAs; S-parameters; base-emitter voltage; collector current; dc I-V characteristics; feedback; forward Gummel plot; multifinger HBTs; multiple bias points; multiple frequencies; self-heating effects; single-finger HBTs; small-signal model; unified analytical large-signal model; Analytical models; Circuit simulation; Coupling circuits; Feedback; Frequency; Gallium arsenide; Heterojunction bipolar transistors; Indium gallium arsenide; Scattering parameters; Voltage;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.900006

Filename

900006