Novel Time-Interleaved Variable Center-Frequency, Single-Bit A/D and D/A Sigma-Delta Modulator Topologies

• Abstract:

  This paper presents the design, modelling and analysis of novel multi-path time-interleaved analog and digital sigma-delta modulators that can operate at any arbitrary centre-frequency from DC to Nyquist. Dual- and quadruple-path fourth-order Butterworth, Chebyshev, inverse Chebyshev and elliptical based sigma-delta modulators are designed, which offer designers the flexibility of specifying the centre-frequency, pass-band/stop-band attenuation as well as the signal bandwidth. These topologies are compared in terms of their signal-to-noise ratios, hardware complexity, stability, tonality and sensitivity to non-idealities. In addition, this paper presents the mathematical modelling and evaluation of tones caused by the finite wordlengths of these digital multi-path sigma-delta modulators when excited by sinusoidal input signals.
• Keywords:

  Bandpass Sigma-Delta, Time-Interleaved, Butterworth, Chebyshev, Inverse-Chebyshev, Elliptical
• Download:

  IMEKO-TC4-2013-140.pdf
• DOI:

  _unreg_tc4-2013.140

Event details:

• IMEKO TC:

  TC4
• Event name:

  TC4 Symposium 2013
• Title:

  19th IMEKO TC4 Symposium Measurements of Electrical Quantities (together with 17th TC4 IWADC Workshop on ADC and DAC Modelling and Testing)
• Place:

  Barcelona, SPAIN
• Time:

  18 July 2013 - 19 July 2013