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High dynamic range pseudo–two‐level digital pulse‐width modulation for power‐efficient RF transmitters
Author(s) -
Arian Amir,
Jannesari Abumoslem
Publication year - 2019
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.2570
Subject(s) - oversampling , pulse width modulation , electronic engineering , baseband , transmitter , aliasing , dynamic range , computer science , modulation (music) , distortion (music) , radio frequency , power (physics) , filter (signal processing) , physics , engineering , electrical engineering , telecommunications , channel (broadcasting) , amplifier , acoustics , cmos , quantum mechanics
Summary Radio frequency (RF) power amplification based on pulse‐width modulation (PWM) has been widely discussed as a potential solution to achieve higher efficiency in RF transmitters. A digitally implemented PWM introduces a large amount of in‐band distortion due to spectral aliasing. In this paper, a novel memoryless PWM modulator with a built‐in anti‐aliasing filter is proposed that effectively reduces the in‐band distortion in digital implementation. The spectral characteristics of the proposed PWM modulator as well as the statistical properties of its output PWM signal are analytically studied. The pseudo–two‐level output of the proposed modulator provides the capability to compromise between the efficiency, linearity, and complexity of transmitter, based on the given design targets. The proposed PWM method benefits from a simple circuit implementation in both digital and RF sections of the transmitter. Moreover, it preserves the low distortion property at low oversampling ratios of digital baseband. Simulations, as well as measurements, verify the performance of the proposed method.