Nuestros investigadores

Ainhoa Rezola Garciandía

Departamento
Departamento de Ingeniería Eléctrica y Electrónica
Escuela de Ingenieros (TECNUN). Universidad de Navarra
Líneas de investigación
Comunicaciones de banda ancha, radiofrecuencia, predistorsión digital
Índice H
6, (Google Scholar, 05/06/2019)

Publicaciones científicas más recientes (desde 2010)

Autores: Gurutzeaga, Iñaki; Rezola, Ainhoa; et al.
Revista: INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
ISSN 0098-9886  Vol. 46  Nº 3  2018  págs. 366 - 374
This paper presents the design of a compact and wide bandwidth millimeter-wave power detector, integrated at the output of an E-band power amplifier and implemented in a 55-nm SiGe BiCMOS process. It is based on a nonlinear PMOS detector core, and its measured output voltage tracks the output power of the PA from 67 to 90GHz. It provides an insertion loss lower than 0.2dB, and its responsivity can be tuned between 8 and 17V/W. The output bandwidth is bigger than 3GHz, which allows built-in self-test when transmitting multigigabit millimeter-wave signals.
Autores: Rezola, Ainhoa; Sevillano, Juan Francisco; Gurutzeaga, Iñaki; et al.
Revista: IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
ISSN 0018-9480  Vol. 65  Nº 11  2017  págs. 4758 - 4769
This paper addresses the estimation and compensation of I/Q imbalance, one of the most prominent impairments found in wideband zero-intermediate frequency transceivers (TRxs). The I/Q imbalance encountered in this kind of TRx comprises not only frequency-selective gain and phase imbalance but also delay imbalance. Unless appropriate compensation is applied, the I/Q imbalance significantly degrades the performance of a communication system. This paper presents a novel compensation technique for transmitter I/Q imbalance based on built-in-self-calibration, a low cost and robust compensation technique that enables manufacturing as well as in-field calibration with low computational complexity. The method's performance is evaluated in a TRx with 64-quadratic-amplitude modulation and 2 GHz of bandwidth implemented with real hardware. The measurements show that the proposed technique achieves an image rejection ratio greater than 35 dB in the entire 2 GHz bandwidth and an error vector magnitude lower than 3%.
Autores: Gurutzeaga, Iñaki; Rezola, Ainhoa; et al.
Revista: IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
ISSN 1531-1309  Vol. 27  Nº 5  2017  págs. 512 - 514
This letter presents a 15-21 GHz I/Q upconverter, based on two Gilbert-cell mixers with an on-chip wideband linearization loop that extends the linear region and allows power efficient operation at backoff power levels. A quadrature LO signal is generated using an integrated two-stage polyphase filter. Measurements show a conversion gain of -5.5 dB, an output 1-dB compression point of 0 dBm, and an image suppression of 40 dB over the 6-GHz output bandwidth. An error vector magnitude of 3.5% is obtained for a 10-Gb/s 64-QAM signal with a bandwidth of 2 GHz. The circuit is integrated in a 55-nm BiCMOS process and occupies 1.07 mm2. The dc power consumption is 61 mW.
Autores: Gurutzeaga, Iñaki; Rezola, Ainhoa; et al.
Revista: IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
ISSN 0018-9480  Vol. 65  Nº 8  2017  págs. 2990 - 3001
This paper presents the design of a wideband and high-linearity E-band transmitter integrated in a 55-nm SiGe BiCMOS technology. It consists of a double-balanced bipolar ring mixer which upconverts a 16-21-GHz IF signal to the 71-76- and 81-86-GHz bands by the use of a 55/65-GHz local oscillator signal, followed by a broadband power amplifier which employs 2-way output power combining using an integrated low-loss balun transformer. The transmitter exhibits an average conversion gain of 24 dB and 22 dB at the 71-76- and 81-86-GHz bands, respectively, with an output 1-dB compression point greater than 14 and 11.5 dBm at each band. A maximum output power of 16.8 dBm is measured at 71 GHz. The dc power consumption is 575 mW. The presented transmitter is used to demonstrate the transmission of a 10.12-Gb/s 64 quadrature amplitude modulated signal with a spectral efficiency of 5.06 bit/s/Hz, which makes it suitable for use in future highcapacity backhaul and fronthaul point-to-point links.
Autores: Rezola, Ainhoa; Sevillano, Juan Francisco; et al.
Revista: INTERNATIONAL JOURNAL OF COMMUNICATION
ISSN 1998-4480  Vol. 9  2015  págs. 98 - 104
Autores: Rezola, Ainhoa; Sevillano, Juan Francisco; Leyh, M.; et al.
Revista: INTERNATIONAL JOURNAL ON ADVANCES IN TELECOMUNICATIONS
ISSN 1942-2601  Vol. 8  Nº 1-2  2015  págs. 25 - 34
Autores: Rezola, Ainhoa; Sevillano, Juan Francisco; et al.
2019 
This book presents design methods and considerations for digitally-assisted wideband millimeter-wave transmitters. It addresses comprehensively both RF design and digital implementation simultaneously, in order to design energy- and cost-efficient high-performance transmitters for mm-wave high-speed communications. It covers the complete design flow, from link budget assessment to the transistor-level design of different RF front-end blocks, such as mixers and power amplifiers, presenting different alternatives and discussing the existing trade-offs. The authors also analyze the effect of the imperfections of these blocks in the overall performance, while describing techniques to correct and compensate for them digitally. Well-known techniques are revisited, and some new ones are described, giving examples of their applications and proving them in real integrated circuits.

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  OTROS MÉRITOS RELEVANTES

- Miembro de la organización del congreso XXVI Conference on Design of Circuits and Integrated Systems celebrado en San Sebastián en 2013. - Responsable de la sesion (session chair) en el congreso The Tenth International Conference on Wireless and Mobile Communication (ICWMC 2014) celebrado en Sevilla en 2014. - Recibí el premio al mejor artículo en el congreso The Tenth International Conference on Wireless and Mobile Communications en junio de 2014 por el artículo Non-frequency-selective IQ Imbalance in Zero-IF Transceivers for Wide-Band mmW Links - Recibí el premio al mejor artículo en el congreso XXXII Conference on Design of Circuits and Integrated Systems.¿ en noviembre de 2017 por el artículo Variable-Length Transmission Lines for Self-Healing Systems and Reconfigurable Millimeter-Wave Integrated Circuits.