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A 230-Watt S-band SiGe heterojunction bipolar transistor

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5 Author(s)
Potyraj, P.A. ; Northrop Grumman ESSD, Baltimore, MD, USA ; Petrosky, K.J. ; Hobart, K.D. ; Kub, F.J.
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Large-area Si/Si1-xGex heterojunction bipolar transistors (HBTs) have been demonstrated with record output power at S-Band. Under pulsed conditions in class C operation, a saturated power in excess of 230 W was achieved at 2.8 GHz. At 200 W the devices exhibited a collector efficiency of 46% and a power gain of 6.9 dB. Devices with implanted Si bases had comparable gain, but only 35% efficiency at 150 W, and saturated at 180 W. In class A operation, 13.5 dB gain was demonstrated at 3.1 GHz on smaller devices. For high fmax, a self-aligned silicided polysilicon-emitter structure was used in conjunction with a graded Si1-xGex base. Variable temperature dc tests and accelerated life tests have indicated no reliability problems. The results indicate for the first time that Si/SiGe HBTs are suitable for high-power, high-frequency applications

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:44 ,  Issue: 12 )

Date of Publication:

Dec 1996

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