A Cellular Multiband DTC-Based Digital Polar Transmitter With −153-dBc/Hz Noise in 14-nm FinFET
| Autor: | Yorgos Palaskas, Thomas Bauernfeind, Jorn Angel, Dimo Martev, Peter Preyler, Ashoke Ravi, Eshel Gordon, Ofir Degani, Timo Gossmann, Sven Hampel, Andreas Holm, Peter Plechinger, Rotem Banin, Thomas Mayer, Paolo Madoglio, Petra Schubert, Jakob Tomasik, Zdravko Boos |
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| Rok vydání: | 2020 |
| Předmět: |
Computer science
020208 electrical & electronic engineering Transmitter dBc 02 engineering and technology Noise (electronics) Power (physics) Phase-locked loop Narrowband 0202 electrical engineering electronic engineering information engineering Electronic engineering Electrical and Electronic Engineering Phase modulation Frequency modulation |
| Zdroj: | IEEE Journal of Solid-State Circuits. 55:1830-1841 |
| ISSN: | 1558-173X 0018-9200 |
| Popis: | A digital polar transmitter is presented that uses a digital-to-time-converter (DTC) for wide-channel phase modulation with multiband support. DTC-based phase modulation enables high-efficiency polar operation with high-efficiency RFDAC. The transmitter uses coarse division inherent in DTC operation to generate TX output frequencies from 0.7 to 2.2 GHz with a limited DCO tuning range of only 7.3–8.7 GHz (±8.7%). Phase modulation of narrowband signals (e.g., one resource block) using DTC could result in spurs in output spectrum due to the almost periodic nature of DTC errors. A theoretical analysis is presented that predicts the location of these spurs and a technique to eliminate such spurs by appropriately adjusting the PLL frequency is introduced. A new digitally controlled-edge-interpolator architecture is also presented to minimize dynamic errors, which is necessary in order to meet stringent cellular noise requirements. The DTC was implemented using digital synthesis and auto-place-and-route (APR) tools, requiring very limited analog layout resources. The TX was fabricated in 14-nm FinFET and it achieved a noise of −153/−150 dBc/Hz for LTE5/LTE20 in Band1 at +4-dBm output power with DTC power dissipation of 27 mW. |
| Databáze: | OpenAIRE |
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