Tunable CMOS Power Amplifiers for Reconfigurable Transceivers

JeeYoung HONG  Daisuke IMANISHI  Kenichi OKADA  Akira MATSUZAWA  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E94-A   No.11   pp.2394-2401
Publication Date: 2011/11/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E94.A.2394
Print ISSN: 0916-8508
Type of Manuscript: PAPER
Category: Circuit Theory
CMOS,  power amplifier,  tunable,  reconfigurable,  

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This paper presents three CMOS power amplifiers (PA) which realize wide-tunable output impedance matching. For realization of multi-standard and single-chip transceiver, the prototypes were fabricated by 0.18 µm CMOS process. The proposed PAs can achieve a tunable impedance matching within a wide frequency range by utilizing a resistive feedback and parallel resonator with an inductor and capacitor array. Therefore, the proposed PA has a realization possibility of isolator-less PA which contributes to decrease die area including external component. In other words, the PAs have tunable impedance matching function at their output ends. With a 3.3-V supply, three power amplifiers can cover frequency ranges of 0.9–3.0 GHz, 2.1–5.8 GHz, and 5.7–9.7 GHz, respectively. The PAs realize P1 dB of 21 dBm, Psat of 22 dBm, and PAEpeak of larger than 23%. The proposed PAs present a potential to realize multi-band transceivers without isolators.