A Precise Method for Determining AlGaAs/GaAs HBT Large-Signal Circuit Parameters Using Bias-Dependent Noise Parameters and Small-Signal S-Parameters

Jun-ichi SHIMIZU  Nobuyuki HAYAMA  Kazuhiko HONJO  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E76-C   No.1   pp.159-162
Publication Date: 1993/01/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Electronic Circuits
Keyword: 
HBT,  large-signal,  S-parameter,  noise parameters,  small-signal,  

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Summary: 
A precise method for determining AlGaAs/GaAs HBT large-signal circuit parameters is presented. In this method, the parameters are extracted from noise parameters and small-signal S-parameters measured under various bias conditions. The measured noise parameters are fitted to the calculated noise parameters derived from an approximation of Hawkins' equations applied to the macroscopic equivalent circuit. The small-signal S-parameters help to determine the large-signal circuit parameters. The derived large-signal parameters were used to design an HBT oscillator. The simulated results using these parameters were in good agreement with the fabricated device performance.