A compact 2.4GHz polar/quadrature reconfigurable digital power amplifier in 28nm logic LP CMOS

Zhu, Yiting; Xiong, Lixia; Yin, Yun; Luo, Wei; Chen, Bowen; Li, Tong; Xu, Hongtao

doi:10.1109/cicc.2018.8357012

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…η avg represents the average drain efficiency of DPA. (7) shows the effect of the number of LO phases on the HB-TX average efficiency. Besides, the LO duty cycle of the transmitter also affects the efficiency.…”

Section: B Mathematical Model For Efficiency Analysismentioning

confidence: 99%

“…As shown in Fig. 6, timing A employed in (7) and timing B employed in (8) are defined. The LO with 25% duty cycle decreases the leakage current in DPA cells so the efficiency with timing B is improved.…”

Section: B Mathematical Model For Efficiency Analysismentioning

confidence: 99%

“…Moreover, due to the delay of phase modulator, synchronizing the amplitude and phase is another obstacle in Polar-TX. The quadrature transmitter (IQ-TX) [5]- [7], in contrast, realizes high-speed and high-precision phase modulation by power recombination of two quadrature vectors. The IQ-TX does not require a high-speed and high-resolution phase modulator while quadrature summation leads to a maximum of -3 dB power loss [8].…”

Section: Introductionmentioning

confidence: 99%

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A Hybrid Digital Transmitter Architecture for High- Efficiency and High-Speed Applications

Shen

et al. 2021

2021 IEEE International Symposium on Circuits and Systems (ISCAS)

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A Quadrature/Polar hybrid digital transmitter architecture (HB-TX) is proposed in this paper, which consists of a main digital power amplifier (DPA), an auxiliary DPA, and a low-bit phase selector. In the proposed HB-TX, coarse polar modulation is realized by combining the main DPA and a low-bit selector, while a fine quadrature modulation is realized by the asymmetrical quadrature recombination of main and auxiliary DPAs in a small range. Through coarse and fine modulation, the HB-TX realizes fast signal modulation and does not require high-speed and high-resolution phase modulator. With the coarse polar modulation, the HB-TX achieves high efficiency which is close to that of polar transmitter and no longer suffers from 3 dB back-off. Since the asymmetry of two-path DPA arrays improves the isolation between two channels, local oscillators (LOs) with 50% duty cycle is employed to further improve the HB-TX's efficiency. Simulation results show that the HB-TX with a 4-bit selector achieves 23.7-dBm peak output power with 39.2% peak power added efficiency (PAE). When modulating a 64-QAM signal with 80-Msym/s symbol rate and 6.5-dB peak average power rate (PAPR), the HB-TX improves the average drain efficiency from 16.3% (achieved in quadrature transmitter) to 22.2%. The average output power that is delivered by the HB-TX is 17.6-dBm with 17.4% average PAE, while the error vector magnitude (EVM) is -35.87 dB.

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Section: B Mathematical Model For Efficiency Analysismentioning

confidence: 99%

Section: B Mathematical Model For Efficiency Analysismentioning

confidence: 99%