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- W2188433724 abstract "The results obtained from a computer-aided thermal analysis of. a microwave power transistor are pre- sented. The transistor is somewhat uniq'ue in that it has a junction-to-carrier thermal time constant of only about 50 pus. The application for which this transistor was desired required that it handle a pulsed power dissipation wherein each pulse has the shape of a fourth power cosine curve with a 7-p~ on-time and 130 watts peak power. The half-power pulsewidth is, therefore, only about 2.5 ps. A-lthough the pulse duration is quite short, the junction undergoes temperature excursions of about 30°C during any single pulse. These temperature ex- cursions cannot possibly be detected by either direct electrical measurements or infrared experimental techniques but, never- theless, have an important effect on the life and reliability of the transistor.. The computer-aided analysis technique and the results are discussed in general throughout the paper. Points of interest include the temperature distribution both on and within the chip, the effects of temperature dependent material properties, the use of a heat spreader under the chip, and, finally, the meaning and significance of the thermal time constant'for the junction, the chip; the carrier, and other parts of the electronic package." @default.
- W2188433724 created "2016-06-24" @default.
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- W2188433724 date "1974-01-01" @default.
- W2188433724 modified "2023-09-27" @default.
- W2188433724 title "Transient Temperat'ure Response of a Power Tran#tor" @default.
- W2188433724 hasPublicationYear "1974" @default.
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