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A 1.4-to-2.7GHz FDD SAW-Less Transmitter for 5G-NR Using a BW-Extended N-Path Filter-Modulator, an Isolated-BB Input and a Wideband TIA-Based PA Driver Achieving <-157.5dBc/Hz OB Noise
Qi,Gengzhen1; Shao,Haijun1; Mak,Pui In1; Yin,Jun1; Martins,Rui P.1,2
2020-02-01
Conference NameIEEE International Solid-State Circuits Conference (ISSCC)
Source PublicationDigest of Technical Papers - IEEE International Solid-State Circuits Conference
Volume2020-February
Pages172-174
Conference DateFEB 16-20, 2020
Conference PlaceSan Francisco, CA
Abstract

For the sub-6GHz 5G New Radio (5G-NR), most FDD bands expand their signal bandwidth (BW) to 20MHz. In the NR-n74 Band (1.45GHz), the duplex spacing (Δf) is only 48MHz. Such a small Δf/BW ratio (2.4) challenges the design of a multiband FDD SAW-less transmitter (TX) that must emit negligible noise at the nearby receiver (RX) band. Previous works [1], [2] use high-order baseband (BB) filters, along with large bias currents, to suppress the out-of-band (OB) noise, but the power (>90mW) and area (-1mm) are large for an OB noise of -158dBc/Hz [2]. Although the charge-domain direct-launch digital TX [3] is more flexible and area-efficient (0.22mm), it entails off-chip baluns to extend the RF coverage, and has a limited output power (-3.5dBm). An alternative is to embed a gain-boosted N-path filter into the TX [4], such that high-Q bandpass filtering can be performed at a flexible RF. Still, the filtering effectiveness of [4] is moderate when the signal BW reaches 10MHz, showing an OB noise of just -154.5dBc/Hz.

DOI10.1109/ISSCC19947.2020.9062951
URLView the original
Indexed ByCPCI-S
Language英語English
WOS Research AreaEngineering
WOS SubjectEngineering, Electrical & Electronic
WOS IDWOS:000570129800062
Scopus ID2-s2.0-85083825876
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Cited Times [WOS]:3   [WOS Record]     [Related Records in WOS]
Document TypeConference paper
CollectionINSTITUTE OF MICROELECTRONICS
Faculty of Science and Technology
THE STATE KEY LABORATORY OF ANALOG AND MIXED-SIGNAL VLSI (UNIVERSITY OF MACAU)
DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
Corresponding AuthorQi,Gengzhen
Affiliation1.University of Macau,Macao
2.University of Lisboa,Lisbon,Portugal
First Author AffilicationUniversity of Macau
Corresponding Author AffilicationUniversity of Macau
Recommended Citation
GB/T 7714
Qi,Gengzhen,Shao,Haijun,Mak,Pui In,et al. A 1.4-to-2.7GHz FDD SAW-Less Transmitter for 5G-NR Using a BW-Extended N-Path Filter-Modulator, an Isolated-BB Input and a Wideband TIA-Based PA Driver Achieving <-157.5dBc/Hz OB Noise[C],2020:172-174.
APA Qi,Gengzhen,Shao,Haijun,Mak,Pui In,Yin,Jun,&Martins,Rui P..(2020).A 1.4-to-2.7GHz FDD SAW-Less Transmitter for 5G-NR Using a BW-Extended N-Path Filter-Modulator, an Isolated-BB Input and a Wideband TIA-Based PA Driver Achieving <-157.5dBc/Hz OB Noise.Digest of Technical Papers - IEEE International Solid-State Circuits Conference,2020-February,172-174.
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