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I/Q mismatch calibration of a transmitter using local quadrature oscillator

Zare Fatin, G ; Sharif University of Technology | 2016

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  1. Type of Document: Article
  2. DOI: 10.1016/j.mejo.2016.07.004
  3. Publisher: Elsevier Ltd , 2016
  4. Abstract:
  5. In this paper a calibration technique for I/Q mismatch of a transmitter is introduced. The calibration technique is based on the fact that all mismatches in I/Q paths can be modeled as the mismatch of the local oscillator quadrature outputs. Based on this fact, a simple tuning scheme for quadrature output of the oscillator is used to calibrate the mismatch of the I/Q transmitter. In addition to quadrature oscillator, gain mismatch of the I/Q paths and LO feedthorugh and leakage is calibrated by using a tunable linear Gm cell in the base band part. In order to demonstrate the proposed technique, a transmitter with 1.8 GHz carrier frequency is designed with auxiliary blocks to extract and cancel out the I/Q mismatches. The simulation results in 0.18 µm RFCMOS process show that the proposed technique can reduce amplitude of the image signal resulting from mismatches in I/Q paths about 18.5 dB in the transmitter output
  6. Keywords:
  7. I/Q calibration ; Mismatch detector ; Synchronous detector ; Transmitter ; Calibration ; Calibration techniques ; Carrier frequency ; Gain mismatch ; Local oscillators ; Mismatch calibration ; Quadrature oscillator ; Quadrature outputs ; Synchronous detectors ; Transmitters
  8. Source: Microelectronics Journal ; Volume 55 , 2016 , Pages 82-91 ; 00262692 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0026269216302415