A 30GHz 4-way Series Doherty Digital Polar Transmitter Achieving 18% Drain Efficiency and -27.6dB EVM while Transmitting 300MHz 64-QAM OFDM Signal

Mortazavi, Mohsen; Shen, Yiyu; Mul, Dieuwert; Vreede, L.C.N. de; Spirito, M.; Babaie, Masoud

doi:10.1109/cicc51472.2021.9431396

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…The Doherty combiner [18] provides a matching network, which aims at maximising the efficiency of the PAs over a range of output power. The circuit model is shown Figure 3a, which represents a two‐way series Doherty combiner [20]. This consists of two PAs, one referred as ‘main’ and the other as ‘peaking’, connected by a quarter‐wave transmission line with characteristic impedance Z 0 .…”

Section: Ppw Parallel Doherty Combinermentioning

confidence: 99%

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Efficient waveguide power combiners at mm‐wave frequencies

Schelven

Spirito

Cavallo

2023

IET Microwaves Antenna & Prop

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In this study, an efficient power combiner for mm-wave frequency transmitters is investigated. The combiner is based on a parallel plate waveguide (PPW) excited with multiple parallel feeds. The Doherty power combiner scheme is also integrated in the proposed concept, to increase the efficiency of the amplifiers when implementing amplitude modulation. The advantage of the proposed PPW combiner with respect to other concepts, for example, the ones based on substrate-integrated waveguide, is the wider bandwidth and the scalability to an arbitrary number of inputs. Measured results from a demonstrator realised in standard printed circuit board technology are presented. Two variations of the combiner are implemented, one terminated with a 50 Ω coaxial output, and another integrated with an antenna. In the latter case, the waveguide is folded so that both the power combiner and the antenna fit within a half wavelength size, and thus would be compatible with a dense antenna array implementation.

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Section: Ppw Parallel Doherty Combinermentioning

confidence: 99%

“…Examples of the implementation of a Doherty power combiner for 5G applications are presented in refs. [19,20].…”

Section: Introductionmentioning

confidence: 99%

Efficient waveguide power combiners at mm‐wave frequencies

Schelven

Spirito

Cavallo

2023

IET Microwaves Antenna & Prop

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“…To improve on those limitations, this paper reports a 4-way series Doherty digital polar TX based on the following techniques [42]. First, a scalable N-way series Doherty combiner is proposed to enhance system efficiency at deep PBOs.…”

Section: Introductionmentioning

confidence: 99%

A Four-Way Series Doherty Digital Polar Transmitter at mm-Wave Frequencies

Mortazavi

Shen

Mul

et al. 2022

IEEE J. Solid-State Circuits

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This paper presents an efficient digital polar transmitter (DPTX) at mm-wave frequencies that exploits a novel N-way series Doherty combiner (SDC) to enhance its drain and system efficiency at deep power back-off (PBO). The proposed N-way SDC is scalable and can be implemented elegantly using N transformers and N-1 shunt capacitors. As a proof of concept, a 4-way Doherty DPTX is realized with the proposed SDC in which four identical but independent digital phase modulators deliver a phase-modulated constant envelope signal to their corresponding digital power amplifiers to perform the required amplitude modulation. Fabricated in a 40-nm CMOS process, the proposed DPTX occupies a core area of 1.1 mm 2 and exhibits 18.7 dBm saturated output power and <-40 dBc LO feedthrough. It demonstrates a drain efficiency of 33%/36%/22% at 0/4.5/11.5 dB PBO at 29.5 GHz carrier frequency. While transmitting a 300 MHz 64-QAM OFDM signal with a peakto-average power ratio of -10.7 dB, the DPTX achieves 18%/8% average drain/system efficiency, -27.6 dB error vector magnitude, and -27.5 dBc adjacent channel leakage ratio. To the best of the authors' knowledge, this work is the first reported mm-wave Doherty transmitter that includes the entire chain all the way from the binary data stream up to the modulated mm-wave output signal.Index Terms-Series Doherty combiner, Digital polar transmitter, Doherty design guide, Digital power amplifier (DPA), Digital phase modulator (DPM), millimeter-wave transmitter, power amplifier (PA).

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A 24-to-32GHz series-Doherty PA with two-step impedance inverting power combiner achieving 20.4dBm P_sat and 38%/34% PAE at P_sat/6dB PBO for 5G applications

Pashaeifar

Kumaran

Beikmirza

et al. 2021

2021 IEEE Asian Solid-State Circuits Conference (A-Sscc)

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A 30GHz 4-way Series Doherty Digital Polar Transmitter Achieving 18% Drain Efficiency and -27.6dB EVM while Transmitting 300MHz 64-QAM OFDM Signal

Cited by 6 publications

References 5 publications

Efficient waveguide power combiners at mm‐wave frequencies

Efficient waveguide power combiners at mm‐wave frequencies

A Four-Way Series Doherty Digital Polar Transmitter at mm-Wave Frequencies

A 24-to-32GHz series-Doherty PA with two-step impedance inverting power combiner achieving 20.4dBm P_sat and 38%/34% PAE at P_sat/6dB PBO for 5G applications

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A 30GHz 4-way Series Doherty Digital Polar Transmitter Achieving 18% Drain Efficiency and -27.6dB EVM while Transmitting 300MHz 64-QAM OFDM Signal

Cited by 6 publications

References 5 publications

Efficient waveguide power combiners at mm‐wave frequencies

Efficient waveguide power combiners at mm‐wave frequencies

A Four-Way Series Doherty Digital Polar Transmitter at mm-Wave Frequencies

A 24-to-32GHz series-Doherty PA with two-step impedance inverting power combiner achieving 20.4dBm Psat and 38%/34% PAE at Psat/6dB PBO for 5G applications

Contact Info

Product

Resources

About

A 24-to-32GHz series-Doherty PA with two-step impedance inverting power combiner achieving 20.4dBm P_sat and 38%/34% PAE at P_sat/6dB PBO for 5G applications