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IEICE TRANSACTIONS on Electronics

High Efficiency AlGaAs/GaAs Power HBTs at a Low Supply Voltage for Digital Cellular Phones

Teruyuki SHIMURA, Takeshi MIURA, Yutaka UNEME, Hirofumi NAKANO, Ryo HATTORI, Mutsuyuki OTSUBO, Kazutomi MORI, Akira INOUE, Noriyuki TANINO

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Summary :

We present a high performance AlGaAs/GaAs power HBT with very low thermal resistance for digital cellular phones. Device structure with emitter air-bridge is utilized and device layout is optimized to reduce thermal resistance based on three-dimensional thermal flow analysis, and in spite of a rather thick substrate (100 µm), which achieved a low thermal resistance of 23/W for a multi-finger (440 µm240 fingers) HBT. This 40 finger HBT achieved power added efficiency (PAE) of over 53%, 29.1 dBm output power (Pout) and high associated gain (Ga) of 13.5 dB with 50 kHz adjacent channel leakage power (Padj) of less than -48 dBc under a 948 MHz π/4-shifted QPSK modulation with 3.4 V emitter-collector voltage. We also investigated the difference of RF performance between two bias modes (constant base voltage and current), and found which mode is adequate for each stage in several stage power amplifier for the first time.

Publication
IEICE TRANSACTIONS on Electronics Vol.E80-C No.6 pp.740-745
Publication Date
1997/06/25
Publicized
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DOI
Type of Manuscript
Special Section PAPER (Special Issue on Microwave and Millimeterwave High-power Devices)
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