A 0.4-1.2GHz Reconfigurable CMOS Power Amplifier for 802.11ah/af Applications

Jaeyong KO  Sangwook NAM  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E102-C   No.1   pp.91-94
Publication Date: 2019/01/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E102.C.91
Type of Manuscript: BRIEF PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
broadband,  CMOS,  IEEE 802.11ah/af standards,  reconfigurable transformer,  power amplifier,  

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Summary: 
A reconfigurable broadband linear power amplifier (PA) for long-range WLAN applications fabricated in a 180nm RF CMOS process is presented here. The proposed reconfigurable in/output matching network provides the PA with broadband capability at the two center frequencies of 0.5GHz and 0.85GHz. The output matching network is realized by a switchable transformer which shows maximum peak passive efficiencies of 65.03% and 73.45% at 0.45GHz and 0.725GHz, respectively. With continuous wave sources, a 1-dB bandwidth (BW1-dB) according to saturated output power is 0.4-1.2GHz, where it shows a minimum output power with a power added efficiency (PAE) of 25.62dBm at 19.65%. Using an adaptive power cell configuration at the common gate transistor, the measured PA under LTE 16-QAM 20MHz (40MHz) signals shows an average output power with a PAE exceeding 20.22 (20.15) dBm with 7.42 (7.35)% at an ACLRE-UTRA of -30dBc, within the BW1-dB.