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Time or frequency interleaved analog-to-digital converters

Time or frequency interleaved analog-to-digital converters

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Nowadays, there are is an increasing need for multimedia communication standards offering multi-access services and high data rates. Downscaling of integrated circuit technologies has made efficient and cost-effective digital signal processing (DSP) hardware possible in many modern wireless communication systems. This trend has contributed in the development of reconfigurable and flexible radio frequency (RF) systems in order to push the analog-to-digital interface close to the antenna by facilitating DSP.

Chapter Contents:

  • 5.1 Introduction
  • 5.2 Principle of time-interleaved ADCs and impacts of mismatches
  • 5.2.1 TIADC principle
  • 5.2.2 The impact of channel mismatches
  • 5.2.2.1 Offset mismatch
  • 5.2.2.2 Gain mismatch
  • 5.2.2.3 Timing mismatch
  • 5.2.2.4 Bandwidth mismatch
  • 5.3 State of the art of interleaved channel mismatches compensation
  • 5.3.1 Analog compensation techniques
  • 5.3.2 Mixed signal compensation techniques
  • 5.3.3 Digital compensation
  • 5.4 Feedforward background calibration technique of clock skews
  • 5.4.1 Digital estimation
  • 5.4.2 Digital correction
  • 5.4.3 Calibration for input at any Nyquist band
  • 5.5 Feedback calibration technique of bandwidth mismatches
  • 5.5.1 Frequency–response mismatch model
  • 5.5.2 Theoretical channel mismatches estimation
  • 5.5.3 Channel mismatches compensation
  • 5.5.3.1 Periodic time-varying correction block
  • 5.5.3.2 Discrete-time-correlation-based estimation block
  • 5.5.4 Simulation results
  • 5.5.4.1 Two interleaved channels and a nine-tone input signal
  • 5.5.4.2 Four interleaved channels and a nine-tone input signal
  • 5.5.4.3 Hardware acquisition of single-tone input signals
  • 5.6 Extended frequency band decomposition σ δ A/D converter
  • 5.6.1 EFBD architecture
  • 5.6.2 Digital reconstruction system (DS)
  • 5.6.3 Adaptation algorithms
  • 5.7 Conclusion
  • References

Inspec keywords: analogue-digital conversion; multi-access systems; telecommunication standards; multimedia communication; signal processing; mobile radio; digital signal processing chips

Other keywords: multimedia communication standards; downscaling; analog-to-digital interface close; high data rates; multiaccess services; integrated circuit technologies; analog-to-digital converters; cost-effective digital signal processing hardware possible; modern wireless communication systems; DSP

Subjects: Multiple access communication; Radio links and equipment; Mobile radio systems; Multimedia communications; A/D and D/A convertors; Signal processing and detection; Computer communications

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