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.
CITATION STYLE
Nikoofard, A., Kananian, S., Hadizadeh, E., & Fotowat-Ahmady, A. (2016). A fully analog side-band cancellation technique in radio-frequency transmitters. Microelectronics Journal, 53, 116–126. https://doi.org/10.1016/j.mejo.2016.04.014
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