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Behavioral modeling of clock feed-through and channel charge injection non-ideal effects in SIMULINK for switched-capacitor integrator

Torkzadeh, P ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. DOI: 10.1016/j.simpat.2009.11.006
  3. Publisher: 2010
  4. Abstract:
  5. Sigma-Delta modulator ADCs used in signal processing applications usually, are implemented by switched-capacitor (SC) circuits and CMOS transmission gates due to its simplicity for implementation. Channel charge injection (CCI) and clock feed-through (CFT) are two major non-ideal effects existing in TG switches and SC integrators reducing modulator total SNR, its linearity and its total gain. This paper presents a precise model for SC integrator including CCI and CFT non-ideal effects in MATLAB SIMULINK environment which allows designers to perform time-domain behavioral simulations of switched-capacitor (SC) Sigma-Delta modulators. Evaluation and validation of extracted models were performed via behavioral and transistor-level simulations for modeled SC integrator, second and third order modulators using SIMULINK and Agilent ADS environments with a generic 0.18 μm CMOS technology. Non-idealities and nonlinearities effects are apparently observed by comparing the ideal modulator in behavioral analysis and actual modulator in circuit-level environment
  6. Keywords:
  7. Channel charge injection ; Clock feed-through ; Channel charge ; Clock feed ; SIMULINK environment ; Switched capacitor integrator ; Transmission gate ; Z-domain ; Capacitance ; Capacitors ; Charge injection ; Clocks ; CMOS integrated circuits ; Cochannel interference ; Delta sigma modulation ; MATLAB ; Modulation ; Signal processing ; Switching circuits ; Modulators
  8. Source: Simulation Modelling Practice and Theory ; Volume 18, Issue 5 , May , 2010 , Pages 483-499 ; 1569190X (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S1569190X09001737