The Power Paradox: The Eternal Struggle Between Linearity an

However， the cost is staggering. The theoretical maximum efficiency of Class A is only 50%， and in practice， it often drops below 20%. This means for every 1 watt of useful signal sent to the antenna， with the remainder converted entirely into waste heat. The energy wasted on the heat sink is the expensive tax paid for that always-ready linearity. ， 4 to 5 watts of battery energy are consumed，。