The transient thermal response of transistor junctions has been described by Mortenson1 and Strickland2 using mathematical and physical models characterized by a number of thermal time constants. Sparkes3 pointed out the dependence of the electrical voltage feedback upon the thermal resistance of transistors, giving a relationship between thermal and electrical parameters of the devices. In a more recent paper Mueller4 has developed the relationships describing the effect of thermal feedback on the electrical parameters of four poles in general.
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