Video lectures from the iCS group @ IIT Madras

1V High-Speed, 14 Bit CTSD Modulator ( 90nm process)

Problem Statement

  • Design of a 1V supply, 14-Bit, High-Speed Continuous-time Sigma-Delta Modulator in UMC90nm process.
  • Achieve high Figure of Merit for the given design problem.
  • Try adding Mash Architecture ( to support higher input signal Bandwidth by reducing OSR)
  • Input Signal to be assumed as a wide-band signal. ie. significant level of out-of-band signals present

Target specifications

  • 1.2V supply ( no supply variations assumed)
  • 2.4Vp-p input signal full-scale amplitude
  • 1kHz to 33MHz input signal Bandwidth
  • Dynamic Range of 86 dB
  • 20mW of power

Architecture-level Constraints/targets

  • 1-Bit quantizer preferred
  • CIFF sigma-delta loop to begin with
  • Try-out Mash structure if possible

Design Details

Updates