Preventing GaN Device VHF Oscillation

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  • Author: ZanHuang, Jason Cuadra
Parasitic oscillation can occur in any switching circuit with fast-changing voltage and current that stimulate a parasitic LC network. The oscillation becomes sustained when positive feedback with gain is present. Preventing oscillation in fast-switching GaN devices is more challenging than in silicon due to 1) Faster dv/dt and di/dt 2) Higher transconductance. Violent sustained VHF oscillation (50-200MHz) will cause destruction. In a half-bridge circuit with high speed devices on both the high and low side, there are three steps that yield sustained oscillation on the high-side device during low-side device turn-on, and vice versa.
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