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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
Source PublicationDigest of Technical Papers - IEEE International Solid-State Circuits Conference
Volume2020-February
Pages172-174
AbstractFor 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
Language英語English
Scopus ID2-s2.0-85083825876
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Document TypeConference paper
CollectionFaculty of Science and Technology
Affiliation1.University of Macau,Macao
2.University of Lisboa,Lisbon,Portugal
First 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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