A highly-efficient multi-band multi-mode digital quadrature transmitter with 2D pre-distortion

Wang, Hua; Peng, Chia-Sheng; Lü, Chao; Chang, Yaopei; Huang, Richard; Chang, Andy; Shih, Genie; Hsu, Ray T.; Liang, Paul; Son, Sangwon; Niknejad, Ali M.; Chien, George; Tsai, Chih-Hou; Hwang, Hoyong

doi:10.1109/iscas.2013.6571890

Cited by 4 publications

References 3 publications

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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 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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Digital transmitter design for mobile devices

et al. 2013

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A linear model of efficiency for Switched-Capacitor RF Power-Amplifiers

Passamani

Ponton

Knoblinger

et al. 2014

2014 10th Conference on Ph.D. Research in Microelectronics and Electronics (PRIME)

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In this paper, a linear model for intrinsic power and efficiency in Radio-Frequency Switched-Capacitor Power Amplifiers (SCPA) is presented. Given a target output power and frequency of operation this model enables sizing the output stage inverter for maximum efficiency by means of back-of-the-envelope equations. The model is validated by SpectreRF simulations for a low-power CMOS 28nm technology for different frequencies of interest

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A highly-efficient multi-band multi-mode digital quadrature transmitter with 2D pre-distortion

Cited by 4 publications

References 3 publications

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

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

Digital transmitter design for mobile devices

A linear model of efficiency for Switched-Capacitor RF Power-Amplifiers

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