A Model To Monitor The Current Gain Long-Term Instability In Algaas/Gaas Hbts Based On Noise And Leakage Current Characteristics
Abbreviated Journal Title
DEVICES; Engineering, Electrical & Electronic; Physics, Applied; Physics, ; Condensed Matter
A simple model is proposed to monitor the d.c. current gain long-term instability in the AlGaAs/GaAs heterojunction bipolar transistor (HBT). It is derived from the theory that the recombination current at the extrinsic base surface increases with time due to the surface degradation process. Furthermore, the initial 1/f noise and base leakage current characteristics have been used to provide the needed model parameters for the HBT surface recombination mechanism and surface quality, respectively. The current gain long-term variations calculated from the model for four HBTs compare favorably with those obtained from measurements. The model proposed is potentially useful to screen unreliable HBT lots without having to carry out the long-term stress test.
"A Model To Monitor The Current Gain Long-Term Instability In Algaas/Gaas Hbts Based On Noise And Leakage Current Characteristics" (1995). Faculty Bibliography 1990s. 1396.