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A fully analog side-band cancellation technique in radio-frequency transmitters

Nikoofard, A ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.mejo.2016.04.014
  3. Publisher: Elsevier Ltd
  4. Abstract:
  5. 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
  6. Keywords:
  7. Direct-conversion TX ; Error vector magnitude (EVM) ; I/Q imbalances ; I/Q mismatch cancellation ; Side-band rejection ratio (SRR) ; Transmitter chain (TX) ; Local area networks ; Quadrature phase shift keying ; Transmitters ; Cancellation techniques ; Circuit implementation ; Direct conversion ; Error vector magnitude ; Mathematical derivation ; Off-the-shelf components ; Radio frequency transmitters ; Side bands ; Radio transmission
  8. Source: Microelectronics Journal ; Volume 53 , Volume 53 , 2016 , Pages 116-126 ; 00262692 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0026269216300337