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  4 Electrical properties of HEMT 

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The HEMT theory is one thing, but the electrical properties show the real power of these devices. In this chapter are described direct current (DC) characteristics, which show the operation performance in fixed voltage biases, radio frequency (RF) performance, showing frequency limitations and high power performance, showing the electric power limitations. On Fig. 4.1 is depicted a symbol used for HEMT in schematics.

Fig. 4.1 HEMT symbols used in schematics for MOS-HEMT (left) and HEMT (right) with Schottky gate contact