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Sökning: WFRF:(Zumbro John E.)

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1.
  • Hussain, Muhammad Waqar, 1985-, et al. (författare)
  • A 500 °C Active Down-Conversion Mixer in Silicon Carbide Bipolar Technology
  • 2018
  • Ingår i: IEEE Electron Device Letters. - : IEEE Press. - 0741-3106 .- 1558-0563. ; 39:6, s. 855-858
  • Tidskriftsartikel (refereegranskat)abstract
    • This letter 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. 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.
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2.
  • Hussain, Muhammad Waqar, 1985-, et al. (författare)
  • A SiC BJT-Based Negative Resistance Oscillator for High-Temperature Applications
  • 2019
  • Ingår i: IEEE Journal of the Electron Devices Society. - : Institute of Electrical and Electronics Engineers (IEEE). - 2168-6734. ; 7:1, s. 191-195
  • Tidskriftsartikel (refereegranskat)abstract
    • This brief presents a 59.5 MHz negative resistanceoscillator for high-temperature operation. The oscillator employs an in-house 4H-SiC BJT, integrated with the requiredcircuit passives on a low-temperature co-fired ceramic substrate. Measurements show that the oscillator operates from room-temperature up to 400 C. The oscillator delivers an output◦power of 11.2 dBm into a 50 Ω load at 25 C, which decreases to 8.4 dBm at 400 C. The oscillation frequency varies by 3.3% in the entire temperature range. The oscillator is biased witha collector current of 35 mA from a 12 V supply and has amaximum DC power consumption of 431 mW.
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