Continuous Time SigmaDelta Modulator based on Digital Delay Loop and Time Quantisation Articles uri icon

authors

  • PREFASI SEN, ENRIQUE JOSE
  • HERNANDEZ GUERRA, LIBORIO

publication date

  • December 2010

start page

  • 1655

end page

  • 1656

issue

  • 25

volume

  • 46

International Standard Serial Number (ISSN)

  • 0013-5194

Electronic International Standard Serial Number (EISSN)

  • 1350-911X

abstract

  • A new sigma delta (SigmaDelta) modulator suitable for ultra-low power dataconverters is introduced. The proposed architecture is based on timeencoding and quantisation using voltage controlled delays such asdigital inverters. The delays together with a phase comparatorimplement a synchronous pulse width modulator (PWM) and a discretetime integrator. An additional analogue integrator provides secondordernoise shaping and compensates the nonlinearity of the digitaldelay. Time quantisation of the two-level PWM signal allows implementinga multibit modulator without requiring linear multibit DACs.