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Table‐based PWM for all‐digital RF transmitters
Author(s) -
Morales Juan Ignacio,
Chierchie Fernando,
Mandolesi Pablo Sergio,
Paolini Eduardo Emilio
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.2590
Subject(s) - pulse width modulation , duty cycle , transmitter , oversampling , robustness (evolution) , electronic engineering , computer science , bandwidth (computing) , electrical engineering , engineering , voltage , telecommunications , channel (broadcasting) , biochemistry , chemistry , gene
Summary In this paper, a novel pulse‐width modulator (PWM) for an all‐digital PWM transmitter based on switching amplification is presented. In this approach, each symbol is represented by a sequence of pre‐computed PWM pulse widths stored in a table that results in reduced error vector magnitude (EVM). A high‐resolution pulse former is then used to build the bipolar radio frequency (RF) signal. Simulations and comparisons to other approaches reported in the literature under different oversampling ratios and finite time resolutions are presented. The impact of nonlinearities in the variable duty‐cycle generator is also analyzed to demonstrate the robustness of the proposed technique.