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Published May 2001 | Published
Book Section - Chapter Open

A 2.4-GHz, 2.2-W, 2-V fully-integrated CMOS circular-geometry active-transformer power amplifier

Abstract

A 2.4-GHz, 2.2-W, 2-V fully integrated circular geometry power amplifier with 50 Ω input and output matching is fabricated using 2.5V, 0.35 pm CMOS transistors. It can also produce 450mW using a 1V supply. Harmonic suppression is 64dB or better. An on-chip circular-geometry active-transformer is used to combine several push-pull low-voltage amplifiers efficiently to produce a larger output power while maintaining a 50 Ω match. This new on-chip power combining and impedance matching method uses virtual ac grounds and magnetic couplings extensively to eliminate the need for any off-chip component such as wirebonds. It also desensitizes the operation of the amplifier to the inductance of bonding wires and makes the design more reproducible. This new topology makes possible a fully-integrated 2.2W, 2.4GHz, low voltage CMOS power amplifier for the first time.

Additional Information

The authors thank Conexant Systems for chip fabrication, particularly R. Magoon, F. In'tveld, J. Powell, A. Vo, and K. Moye. We also acknowledge Intel corp., Army research office, JPL, Infinion, and NSF for support of this project. K. Potter, D. Ham, and H. Wu of Caltech, deserve special thanks for their assistance. The technical support for CAD tools from Agilent Technologies and SONNET Software, Inc. are also appreciated.

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August 21, 2023
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