A high-efficiency HBT MMIC power amplifier

R. Ramachandran*, M. Nijjar, A. Podell, E. Stoneham, S. Mitchell, N. L. Wang, W. J. Ho, Mau-Chung Chang, G. J. Sullivan, J. A. Higgins, P. M. Asbeck

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

13 Scopus citations


An AlGaAs/GaAs heterojunction bipolar transistor monolithic microwave IC (HBT MMIC) power amplifier is developed that demonstrates very high power-added efficiency, high gain, and broad bandwidth. It uses a cascode structure with four 200-μm common-emitter HBT cells driving four common-base cells of the same size. This amplifier achieves over 14-dB gain from 6 to 10 GHz, with a peak power-added efficiency (PAE) of 47% at 7.5 GHz at an output power level of 31 dBm. This corresponds to a power density of over 3 W per millimeter of emitter length. Input and output matching networks, as well as biasing networks, are all contained within the chip, which measures 80 × 80 mils (2 × 2 mm).

Original languageEnglish
Number of pages4
StatePublished - 1 Oct 1990
Event12th Annual IEEE Gallium Arsenide Integrated Circuit Symposium - GaAs IC - New Orleans, LA, USA
Duration: 7 Oct 199010 Oct 1990


Conference12th Annual IEEE Gallium Arsenide Integrated Circuit Symposium - GaAs IC
CityNew Orleans, LA, USA

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