Relation between low-frequency noise and long-term reliability of single AlGaAs/GaAs power HBT's

被引:23
|
作者
Mohammadi, S [1 ]
Pavlidis, D
Bayraktaroglu, B
机构
[1] Univ Michigan, Dept Elect Engn & Comp Sci, Ann Arbor, MI 48109 USA
[2] Northrop Grumman Adv Technol Lab, Linthicum, MD 21090 USA
关键词
D O I
10.1109/16.830979
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Self-aligned AlGaAs/GaAs single heterojunction bipolar transistors (HBT;s) were fabricated using an advanced processing technology for microwave and millimeter-wave power applications, These devices were processed simultaneously, on different epilayers with similar Layer structure design supplied from different vendors. They showed similar de characteristics (current gain, beta = 30) and their microwave performance was also identical (f(T) = 60 GHz, f(max) = 100 GHz). The HBT's showed different noise and reliability characteristics depending on their epilayer origin, HBT's from the high-reliability wafer showed MTTF of 10(9) h at junction temperature of 120 degrees C. They also presented very small 1/f noise with corner frequencies in the range of a few hundred Hz, Devices were subjected to bias and temperature stress for testing their noise and reliability characteristics. Stressed and unstressed devices showed generation-recombination noise with activation energies between 120-210 meV, Stress was found to increase the generation-recombination noise intensity but not its activation energy, These HBT's did not show any surface-related noise indicating that processing did not significantly influence noise characteristics. It was found that the base noise spectral density at low frequency can be correlated to the device long term reliability.
引用
收藏
页码:677 / 686
页数:10
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