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Combining high voltage, high frequency RF and operation in the linear mode is the challenge. High voltage transistors for low frequency or class C have been around since the horizontal output tube went solid state in televisions. While MOSFET's have high operating voltages, check out the Insulated Gate Bipolar Transistor (IGBT). They have about the highest operating voltage of any transistors but only run switch mode too.

[QUOTE="Shockwave, post: 742930, member: 10882"] Combining high voltage, high frequency RF and operation in the linear mode is the challenge. High voltage transistors for low frequency or class C have been around since the horizontal output tube went solid state in televisions. While MOSFET's have high operating voltages, check out the Insulated Gate Bipolar Transistor (IGBT). They have about the highest operating voltage of any transistors but only run switch mode too. [/QUOTE]

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