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![]() | |
2015-10-01 | |
Source Publication | IEEE Transactions on Microwave Theory and Techniques
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ISSN | 00189480 |
Volume | 63Issue: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. |
Keyword | Adjacent 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 |
DOI | http:doi.org/10.1109/TMTT.2015.2462815 |
URL | View the original |
Indexed By | SCI |
Language | 英语 |
WOS Research Area | Engineering |
WOS Subject | Engineering, Electrical & Electronic |
WOS ID | WOS:000362357900024 |
Fulltext Access | |
Citation statistics | |
Document Type | Journal article |
Collection | INSTITUTE OF MICROELECTRONICS |
Affiliation | 1.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 Affilication | Faculty 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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