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Artículo

An RF Modulation Based on k -th Order PWM Harmonic

Morales, Juan IgnacioIcon ; Chierchie, FernandoIcon ; Mandolesi, Pablo Sergio; Paolini, Eduardo Emilio
Fecha de publicación: 06/2024
Editorial: Institute of Electrical and Electronics Engineers
Revista: IEEE Transactions on Circuits and Systems I: Regular Papers
ISSN: 1549-8328
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Ingeniería Eléctrica y Electrónica

Resumen

A Sub-Nyquist Radio Frequency Pulse Width Modulation (RFPWM) technique, which extends the concept of Sub-Nyquist DACs to RFPWM, is introduced in this paper. The carrier frequency is selected as the k -th order harmonic of the PWM switching frequency. This choice enables operation within an extended frequency range for a particular switching transistor in contrast to the conventional RFPWM approach, where the carrier and switching frequencies are identical. The feasibility of this methodology is verified by both extensive simulations and experimental measurements. While there is a reduction in output power proportional to the harmonic number, this approach has the potential to set the transmitted power to these fixed steps in an all-digital format without compromising spectral performance, as evidenced by comprehensive simulations. Furthermore, the method exhibits strong spectral performance within and outside the desired frequency bands across different quantization scenarios, covering carrier frequencies up to four times the switching frequency. The proof of concept for Sub-Nyquist RFPWM transmitter is a fully digital field-programmable gate array (FPGA) implementation, enabling adaptability to multistandard signals. The pulse position/pulse-width modulation is based on an outphasing approach, using the FPGA transceivers to generate the high-speed binary waveform. Measurements were carried out using a 1.4-MHz LTE 64-QAM signal with a PWM switching frequency of 311 MHz, achieving ACPR values below −39 dBc when the second and third harmonics were used as carrier frequencies (622 MHz and 933 MHz, respectively).
Palabras clave: Pulse-width modulation (PWM) , Radio frequency (RF) , field-programmable gate array (FPGA) , , switched-mode power amplifiers (SMPA)
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/242368
URL: https://ieeexplore.ieee.org/document/10477945/
DOI: https://doi.org/10.1109/TCSI.2024.3376978
Colecciones
Articulos(IIIE)
Articulos de INST.DE INVEST.EN ING.ELECTRICA "A.DESAGES"
Citación
Morales, Juan Ignacio; Chierchie, Fernando; Mandolesi, Pablo Sergio; Paolini, Eduardo Emilio; An RF Modulation Based on k -th Order PWM Harmonic; Institute of Electrical and Electronics Engineers; IEEE Transactions on Circuits and Systems I: Regular Papers; 71; 6; 6-2024; 2687-2695
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