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One of the best things about FET's is that they have a positive Temperature Co-efficient. The hotter they get the less current they conduct.
Bi-polar transistors the hotter they get the more power they will conduct and end up in thermal runaway. That's the negative temperature Co-efficient. That's why BETA MATCHING is so important for amplifiers.

[QUOTE="Tallman, post: 586355, member: 32129"] One of the best things about FET's is that they have a positive Temperature Co-efficient. The hotter they get the less current they conduct. Bi-polar transistors the hotter they get the more power they will conduct and end up in thermal runaway. That's the negative temperature Co-efficient. That's why BETA MATCHING is so important for amplifiers. [/QUOTE]

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