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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
IEICE TRANSACTIONS on Electronics
Publication Date: 1993/01/25
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Electronic Circuits
HBT, large-signal, S-parameter, noise parameters, small-signal,
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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.