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1. How a power transistor works
1.1 A few definitions
The traditions and characteristics of tubes and solid state have led to differences in vocabulary. For example, tubes have a bell-shaped curve P out (P in ): past a certain point, they are oversaturated and output power decreases as input power increases. Corresponding to a precise input power, the top of the curve gives the saturation output power P sat . A transistor doesn't exhibit this bell-shaped response, and it's always possible to increase output power even very slightly by increasing input power. But, this is at the expense of gain, efficiency, linearity and even reliability. Since transistors exhibit little gain compression...
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How a power transistor works
Maximum transistor power
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A complete list would be difficult to draw up in the case of the solid state, given the diversity of the players involved. It would have to include epitaxial wafer manufacturers, foundries (open or not, or even captive foundries, some of which are large industrial laboratories with a predominantly research activity), design houses, microelectronics assembly companies, transmitter manufacturers and even some...
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