• DocumentCode
    427227
  • Title

    A high efficiency transmitter with a delta-sigma modulator and a noise cancellation circuit

  • Author

    Matsuura, T. ; Adachi, H.

  • fYear
    2004
  • fDate
    11-12 Oct. 2004
  • Firstpage
    57
  • Lastpage
    60
  • Abstract
    We propose a new architecture for a transmitter with a delta-sigma modulator and a noise cancellation circuit. A data converter including a deltasigma modulator quantizes the magnitude of the baseband data, which comprises of the in-phase data, I, and the quadrature-phase data, Q. When considering a transmitter with a data converter, a bigb efliciency nonlinear power amplifier can be used, since the envelope of the input signal is quantized to single bit. Quantization noise due to the delta-sigma modulator is canceled by combining an error signal with the same amplitude and opposite phase, without the need for a high Q band-pass filter. Operation of the noise cancellation circuit is verified, and its efficiency is found to be 40%.
  • Keywords
    Band pass filters; Baseband; Circuit noise; Delta modulation; Frequency; Noise cancellation; Nonlinear distortion; Quantization; Sampling methods; Transmitters;
  • fLanguage
    English
  • Publisher
    ieee
  • Conference_Titel
    Wireless Technology, 2004. 7th European Conference on
  • Conference_Location
    Amsterdam, The Netherlands
  • Print_ISBN
    1-58053-991-2
  • Type

    conf

  • Filename
    1394769