Digital Interpolating Phase Modulator for Wideband Outphasing Transmitters

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Digital Interpolating Phase Modulator for Wideband Outphasing Transmitters. / Lemberg, Jerry; Kosunen, Marko; Roverato, Enrico; Martelius, Mikko; Stadius, Kari; Anttila, Lauri; Valkama, Mikko; Ryynänen, Jussi.

In: IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS, Vol. 63, No. 5, 23.03.2016, p. 705-715 .

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Lemberg, Jerry ; Kosunen, Marko ; Roverato, Enrico ; Martelius, Mikko ; Stadius, Kari ; Anttila, Lauri ; Valkama, Mikko ; Ryynänen, Jussi. / Digital Interpolating Phase Modulator for Wideband Outphasing Transmitters. In: IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS. 2016 ; Vol. 63, No. 5. pp. 705-715 .

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@article{6123465f91aa4b2db280176b831cd84a,
title = "Digital Interpolating Phase Modulator for Wideband Outphasing Transmitters",
abstract = "Radio transmitters are evolving towards digital-intensive solutions to exploit reconfigurability and benefit from CMOS process scaling. Outphasing has been identified as a suitable candidate for digital wideband transmitters. However, with recent digital-intensive outphasing transmitters the achieved performance in terms of adjacent channel leakage ratio (ACLR) has been limited. This paper identifies the sampling images of the modulating phase signal as the main factor limiting the ACLR of digital outphasing transmitters. We present a new digital interpolating phase modulator architecture, capable of providing significantly better sampling image attenuation. When evaluated in outphasing configuration with a 100 MHz OFDM signal at the carrier frequency of 2.46 GHz, and 10-bit phase resolution, the proposed solution achieves an ACLR of −59 dBc, compared to −43 dBc achievable with the phase modulator architecture utilized in state-of-the-art digital outphasing transmitters. The proposed digital interpolating phase modulator is also capable of custom carrier generation, a straightforward method for generating an arbitrary carrier frequency up to 1.25 times the phase modulator sampling rate.",
author = "Jerry Lemberg and Marko Kosunen and Enrico Roverato and Mikko Martelius and Kari Stadius and Lauri Anttila and Mikko Valkama and Jussi Ryyn{\"a}nen",
year = "2016",
month = "3",
day = "23",
doi = "10.1109/TCSI.2016.2529280",
language = "English",
volume = "63",
pages = "705--715",
journal = "IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS",
issn = "1549-8328",
number = "5",

}

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TY - JOUR

T1 - Digital Interpolating Phase Modulator for Wideband Outphasing Transmitters

AU - Lemberg, Jerry

AU - Kosunen, Marko

AU - Roverato, Enrico

AU - Martelius, Mikko

AU - Stadius, Kari

AU - Anttila, Lauri

AU - Valkama, Mikko

AU - Ryynänen, Jussi

PY - 2016/3/23

Y1 - 2016/3/23

N2 - Radio transmitters are evolving towards digital-intensive solutions to exploit reconfigurability and benefit from CMOS process scaling. Outphasing has been identified as a suitable candidate for digital wideband transmitters. However, with recent digital-intensive outphasing transmitters the achieved performance in terms of adjacent channel leakage ratio (ACLR) has been limited. This paper identifies the sampling images of the modulating phase signal as the main factor limiting the ACLR of digital outphasing transmitters. We present a new digital interpolating phase modulator architecture, capable of providing significantly better sampling image attenuation. When evaluated in outphasing configuration with a 100 MHz OFDM signal at the carrier frequency of 2.46 GHz, and 10-bit phase resolution, the proposed solution achieves an ACLR of −59 dBc, compared to −43 dBc achievable with the phase modulator architecture utilized in state-of-the-art digital outphasing transmitters. The proposed digital interpolating phase modulator is also capable of custom carrier generation, a straightforward method for generating an arbitrary carrier frequency up to 1.25 times the phase modulator sampling rate.

AB - Radio transmitters are evolving towards digital-intensive solutions to exploit reconfigurability and benefit from CMOS process scaling. Outphasing has been identified as a suitable candidate for digital wideband transmitters. However, with recent digital-intensive outphasing transmitters the achieved performance in terms of adjacent channel leakage ratio (ACLR) has been limited. This paper identifies the sampling images of the modulating phase signal as the main factor limiting the ACLR of digital outphasing transmitters. We present a new digital interpolating phase modulator architecture, capable of providing significantly better sampling image attenuation. When evaluated in outphasing configuration with a 100 MHz OFDM signal at the carrier frequency of 2.46 GHz, and 10-bit phase resolution, the proposed solution achieves an ACLR of −59 dBc, compared to −43 dBc achievable with the phase modulator architecture utilized in state-of-the-art digital outphasing transmitters. The proposed digital interpolating phase modulator is also capable of custom carrier generation, a straightforward method for generating an arbitrary carrier frequency up to 1.25 times the phase modulator sampling rate.

UR - http://www.scopus.com/inward/record.url?scp=84961572614&partnerID=8YFLogxK

U2 - 10.1109/TCSI.2016.2529280

DO - 10.1109/TCSI.2016.2529280

M3 - Article

VL - 63

SP - 705

EP - 715

JO - IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS

JF - IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS

SN - 1549-8328

IS - 5

ER -

ID: 3244975