All-Digital LTE SAW-Less Transmitter With DSP-Based Programming of RX-Band Noise

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Authors

Date

2017-11-21

Department

Department of Electronics and Nanoengineering

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Mcode

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Language

en

Pages

12

Series

IEEE Journal of Solid-State Circuits, Volume 52, issue 12, pp. 3434-3445

Abstract

We present the first all-digital LTE transmitter (TX) using programmable digital attenuation of receive band (RX-band) noise. The system is architectured to fully exploit the speed and low cost of DSP logic in deep-submicrometer CMOS processes, without increasing at all the design effort of the RF circuitry. To achieve operation without surface acoustic wave filter, the TX uses digital bandpass delta-sigma modulation and mismatch-shaping to attenuate the DAC noise at a programmable duplex distance. These functions can be implemented entirely within DSP, thus taking advantage of the standard digital design methodology. Furthermore, the fully digital RX-band noise shaping significantly relaxes the performance requirements on the RF front-end. Therefore, 10 bits of resolution for the D/A conversion are sufficient to achieve -160 dBc/Hz out-of-band (OOB) noise, without need for digital predistortion, calibration, or bulky analog filters. The TX was fabricated in 28-nm CMOS, and occupies only 0.82 mmsuperscript2. Besides low OOB noise, our system also demonstrates state-of-art linearity performance, with measured CIM3/CIM5 below -67 dBc, and adjacent-channel leakage ratio of -61 dBc with LTE20 carrier. The circuit consumes 150 mW from 0.9-/1.5-V supplies at +3 dBm output power.

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Keywords

All-digital transmitter (TX), Attenuation, Baseband, delta-sigma, LTE, mismatch-shaping, Modulation, Noise shaping, Quantization (signal), Radio frequency, receive band (RX-band) noise, RF-DAC, Standards

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DOI

10.1109/JSSC.2017.2761781

Citation

Roverato, E, Kosunen, M, Cornelissens, K, Vatti, S, Stynen, P, Bertrand, K, Korhonen, T, Samsom, H, Vandenameele, P & Ryynanen, J 2017, 'All-Digital LTE SAW-Less Transmitter With DSP-Based Programming of RX-Band Noise', IEEE Journal of Solid-State Circuits, vol. 52, no. 12, pp. 3434-3445. https://doi.org/10.1109/JSSC.2017.2761781

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https://urn.fi/URN:NBN:fi:aalto-201809215157

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[article-cris] Sähkötekniikan korkeakoulu / ELEC