A fully analog side-band cancellation technique in radio-frequency transmitters. (July 2016)

• Record Type: Journal Article
• Authors: Nikoofard, Ali; Kananian, Siavash; Hadizadeh, Ehsan; Fotowat-Ahmady, Ali
• Is Part Of: Microelectronics journal. Volume 53(2016)
• Page Start: 116
• Page End: 126
• Publication Date: 2016-07
• Subjects: I/Q imbalances -- I/Q mismatch cancellation -- Error vector magnitude (EVM) -- Side-band rejection ratio (SRR) -- Transmitter chain (TX) -- Direct-conversion TX; Microelectronics -- Periodicals; Microélectronique -- Périodiques; Microelectronics; Electronic journals; Journals - contents and abstracts; Periodicals; 621.3805
• DOI: 10.1016/j.mejo.2016.04.014
• Languages: English
• ISSNs: 0959-8324

Abstract

Abstract: In this paper, a new fully analog technique is proposed by means of which the adverse effects of frequency dependent gain/phase errors in quadrature transmitters are suppressed. Two separate phase and gain mismatch cancellation loops are implemented which search for the minimum side-band component. A new sign detection method is also introduced which makes sure the direction of the loop is correct. Analytical models and mathematical derivations have been presented which corroborates the circuit implementation. A proof of concept prototype using off-the-shelf components have also been measured which suggests 38-dB side-band rejection (SBR). Furthermore, the measured TX EVM and BER are improved by an order of magnitude for a QPSK-modulated input signal.