High-temperature electronics - a role for wide bandgap semiconductors?

P.G. Neudeck, R.S. Okojie, Liang-Yu Chen
2002 Proceedings of the IEEE  
This paper presents an active down-conversion mixer for high-temperature communication receivers. The mixer is based on an in-house developed 4H-SiC BJT and down-converts a narrow-band RF input signal centered around 59 MHz to an intermediate frequency of 500 kHz. Measurements show that the mixer operates from room temperature up to 500 • C. The conversion gain is 15 dB at 25 • C, which decreases to 4.7 dB at 500 • C. The input 1-dB compression point is 1 dBm at 25 • C and -2.5 dBm at 500 • C.
more » ... .5 dBm at 500 • C. The mixer is biased with a collector current of 10 mA from a 20 V supply and has a maximum DC power consumption of 204 mW. High-temperature reliability evaluation of the mixer shows a conversion gain degradation of 1.4 dB after 3-hours of continuous operation at 500 • C.
doi:10.1109/jproc.2002.1021571 fatcat:z6fuotkeirexvmom3hhvsmuqk4