Mixed-Mode Simulation of DX Trap-Induced Slow Transient Effects on AlGaAs/GaAs HEMT Inverters

Ta-Hui Wang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


A mixed level device and circuit simulation has been performed to analyze DX trap-induced slow transient effects on the performance degradation of AlGaAs/GaAs HEMT circuits. The variation of the output pulsewidth and the hysteretic characteristics of the input-output voltage transfer function in DCFL HEMT inverters have been simulated. In the model, a DX trap rate equation is calculated in the AlGaAs layer. The self-consistent Schrödinger and Poisson equations are solved numerically at each cross section of a device. A two-region Grebene-Ghandhi model is employed to derive the I-V characteristics. Connections between individual HEMT devices in simulated circuits are treated as nodes of circuit equations. In the simulation, all of the device equations and the circuit equations are iteratively solved until a self-consistent solution is achieved. Our simulation confirms that the output pulse broadening and narrowing effects in a string cascaded DCFL HEMT inverters are a consequence of the inverter voltage transfer function shift caused by deep traps.

Original languageEnglish
Article number83720
Pages (from-to)1993-1998
Number of pages6
JournalIEEE Transactions on Electron Devices
Issue number9
StatePublished - Sep 1991

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