Sub-nanosecond pulse characteristics of InGaP/GaAs HBTs
2010
Using a novel sub-nanosecond pulse current-voltage measurement technique, InGaP/GaAs heterojunction bipolar transistors were shown to survive strong impact ionization and to have a much larger safe operating area than previously measured or predicted. As the result, an empirical model for impact ionization was constructed and added to a commercially available HBT model. The modified model can predict the HBT characteristics across the entire safe operating area, including strong impact ionization and flyback. The modified model can be used to simulate not only the ruggedness of power amplifiers, but also the performance of impulse-based ultra wideband pulse generators.
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