ISM system solutions encompass thousands of distinct applications operating across a wide spectrum of frequencies, typically spanning from direct current (DC) up to 6GHz. This extensive range covers frequency bands from high frequency (HF) through very high frequency (VHF) to ultra-high frequency (UHF). Within these diverse ISM applications, loads frequently exhibit significant variability due to aging effects, material inconsistencies, and varying processing conditions. This inherent variability demands that RF power amplifiers (RFPA) possess exceptional robustness under extreme operating conditions to reliably function in demanding environments.