Multi-level asynchronous delta-sigma modulation based ADC

Khoddam, M ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1109/ICIAS.2012.6306108
  3. Publisher: 2012
  4. Abstract:
  5. A Multi-level asynchronous delta sigma modulator consist of several Schmitt-triggers and a novel time-to-digital converter is presented as a core of a delta sigma modulation based analog to digital converter (ADC). The modulator firstly modulates the amplitude of its analog input signal to a multilevel asynchronous duty-cycle modulated signal. Then a time to digital converter (TDC) must be applied to generate digital representation of the received signal from the multi-level asynchronous duty-cycle modulated signal. A multi-level structure has been developed in this work while the prior works often used a single Schmitt. One of the most important limitations in conventional asynchronous delta sigma modulation based ADCs is the resolution of time-to-digital converter and it depends on CMOS technology. To adopt for multi level modulator, here, a novel TDC is presented. Simulation results show that using the proposed multi-level delta sigma modulation based ADC allows achieving better performance comparing to conventional single-level modulators
  6. Keywords:
  7. Analog input signals ; Analog to digital converters ; CMOS technology ; Delta sigma modulator ; Digital representations ; Duty cycles ; Modulated signal ; Multi-level structures ; Multilevels ; Received signals ; Time to digital converters ; Analog to digital conversion ; CMOS integrated circuits ; Delta sigma modulation ; Digital to analog conversion ; Frequency converters ; Modulation ; Modulators
  8. Source: ICIAS 2012 - 2012 4th International Conference on Intelligent and Advanced Systems: A Conference of World Engineering, Science and Technology Congress (ESTCON) - Conference Proceedings, 12 June 2012 through 14 June 2012 ; Volume 2 , June , 2012 , Pages 725-728 ; 9781457719677 (ISBN)
  9. URL: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6306108