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A Sub-GHz wireless transmitter utilizing a multi-class-linearized PA and time-domain wideband-auto I/Q-LOFT calibration for IEEE 802.11af WLAN
Ka-Fai Un1; Wei-Han Yu1; Chak-Fong Cheang1; Gengzhen Qi1; Pui-In Mak1; Rui P. Martins1,2
2015-10-01
Source PublicationIEEE Transactions on Microwave Theory and Techniques
ISSN00189480
Volume63Issue:10Pages:3228-3241
Abstract

Broadband dynamic spectrum access in the sub-GHz band emerges as a potential solution for deploying low-cost range-enhanced wireless connectivity, suitable for under/less-developed countries. This paper describes a sub-GHz wireless transmitter (TX) with an integrated multi-class-linearized power amplifier (PA) compliant with the IEEE 802.11af wireless local-area network. It features a wideband in-phase/quadrature (I/Q) modulator exploiting two-stage 6-/14-path harmonic-rejection mixers plus G-C low-pass filters to manage the spurs emission induced by hard-switched mixing. The entailed 8/16-phase local oscillator (LO) is generated by injection-locked phase correctors plus frequency dividers to relax the frequency and tuning range of the reference LO. The linearized PA features overdriven-class-A/B/C cells to balance the power efficiency and linearity; a dual-gate input pair to enlarge the linear gain range; and a wideband low-impedance ground at the second harmonic to suppress the harmonic distortion and ground bounces. The wideband I/Q imbalance and LO feedthrough are resolved by automatic digital calibration, which incorporates time-domain parameter estimation for better computational efficiency. Benchmarking with the recent art, this TX + PA solution fabricated in 65-nm CMOS exhibits higher system power efficiency (from 7.4% to 18.5%) and 1-dB compression point (from OP : + 12.5 to + 16.3 dBm). When delivering a 64-QAM orthogonal frequency division multiplexing signal at >+ 10 dBm, the chip demonstrates sufficiently low noise floor (-143 dBc/Hz), adjacent channel leakage ratio (<-40 dB), and error vector magnitude (<3.7%) fulfilling the specifications.

KeywordAdjacent Channel Leakage Ratio (Aclr) Cmos Digital Calibration Gm-c Low-pass Filter Harmonic Rejection Mixer (Hrm) Harmonic Rejection Ratio (Hrr) Ieee 802.11af Image Rejection Ratio (Irr) In-phase/quadrature (I/q) Imbalance Lo Feedthrough (Loft) Lo-leakage Rejection Ratio (Lrr) Local Oscillator (Lo) Power Amplifier (Pa) Transmitter (Tx) Wideband
DOIhttp:doi.org/10.1109/TMTT.2015.2462815
URLView the original
Indexed BySCI
Language英语
WOS Research AreaEngineering
WOS SubjectEngineering, Electrical & Electronic
WOS IDWOS:000362357900024
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Citation statistics
Cited Times [WOS]:5   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionINSTITUTE OF MICROELECTRONICS
Affiliation1.State-Key Laboratory of Analog and Mixed-Signal VLSI, and Faculty of Science and Technology, Department of Electrical and Computer Engineering, University of Macau, Macao, China
2.Instituto Superior Técnico, Universidade de Lisboa, 1649-004 Lisbon, Portugal
First Author AffilicationFaculty of Science and Technology
Recommended Citation
GB/T 7714
Ka-Fai Un,Wei-Han Yu,Chak-Fong Cheang,et al. A Sub-GHz wireless transmitter utilizing a multi-class-linearized PA and time-domain wideband-auto I/Q-LOFT calibration for IEEE 802.11af WLAN[J]. IEEE Transactions on Microwave Theory and Techniques,2015,63(10):3228-3241.
APA Ka-Fai Un,Wei-Han Yu,Chak-Fong Cheang,Gengzhen Qi,Pui-In Mak,&Rui P. Martins.(2015).A Sub-GHz wireless transmitter utilizing a multi-class-linearized PA and time-domain wideband-auto I/Q-LOFT calibration for IEEE 802.11af WLAN.IEEE Transactions on Microwave Theory and Techniques,63(10),3228-3241.
MLA Ka-Fai Un,et al."A Sub-GHz wireless transmitter utilizing a multi-class-linearized PA and time-domain wideband-auto I/Q-LOFT calibration for IEEE 802.11af WLAN".IEEE Transactions on Microwave Theory and Techniques 63.10(2015):3228-3241.
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