ARTÍCULO

Built-in-self-calibration for I/Q imbalance in wideband millimeter-wave gigabit transmitters

Autores: Rezola Garciandía, Ainhoa; Sevillano Berasategui, Juan Francisco; Gurutzeaga Zubillaga, Iñaki; del Río Orduña, David; Berenguer Pérez, Roque José; Vélez Isasmendi, Igone
Título de la revista: IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
ISSN: 0018-9480
Volumen: 65
Número: 11
Páginas: 4758 - 4769
Fecha de publicación: 2017
Lugar: WOS
Resumen:
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%.