ON-LINE CALIBRATION AND DIGITAL CORRECTION OF MULTI-BIT SIGMA-DELTA MODULATORS

• Abstract:

  In this paper a novel method for the on-line calibration of the DAC used in multi-bit sigma-delta modulators is described. The proposed solution uses an additional trans- mission zero in the noise transfer function located at half of the sampling frequency. The mismatch between each unity element and a reference is properly modulated and located at the notch position. Since the notch frequency is noise free a simple digital processing allows us to measure mismatches and to store them in a digital memory for digital calibration purposes. The paper shows how to practically implement the above-described approach and discusses a convenient method to attain digital correction. Simulation results verify the proposed technique.
• Keywords:

  On-line Calibration, Sigma-delta
• Download:

  IMEKO-IWADC-2003-13.pdf
• DOI:

  _unreg_iwadc-2003.13

Event details:

• IMEKO TC:

  TC4
• Event name:

  IWADC 2003
• Title:

  VIIIth IMEKO TC4 Workshop on ADC modelling and testing

• Place:

  Perugia, ITALY
• Time:

  8 September 2003 - 10 September 2003