Design of an ultra low power third order continuous time current mode ΣΔ modulator for WLAN applications.

Journal of advanced research · 2014 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 3054

A third-order continuous-time current-mode ΣΔ modulator for WLAN 802.11b applications is presented. The modulator is reported to achieve >60 dB dynamic range for 20 MHz signal bandwidth at OSR=10 while consuming 914 μW from a 1.8 V supply, with a calculated F…

Study snapshot

PublicationJournal of advanced research · 2014

Study typeengineering

Reported directionUnclear

Evidence ratingInsufficient

Abstract

This paper presents a third order continuous time current mode ΣΔ modulator for WLAN 802.11b standard applications. The proposed circuit utilized feedback architecture with scaled and optimized DAC coefficients. At circuit level, we propose a modified cascade current mirror integrator with reduced input impedance which results in more bandwidth and linearity and hence improves the dynamic range. Also, a very fast and precise novel dynamic latch based current comparator is introduced with low power consumption. This ultra fast comparator facilitates increasing the sampling rate toward GHz frequencies. The modulator exhibits dynamic range of more than 60 dB for 20 MHz signal bandwidth and OSR of 10 while consuming only 914 μW from 1.8 V power supply. The FoM of the modulator is calculated from two different methods, and excellent performance is achieved for proposed modulator.

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeengineering

Effect directionunclear

PopulationNot supplied

Sample sizeNot supplied

ExposureNot supplied

Evidence strengthInsufficientConfidence: 78% · Peer reviewed: yes

Main findings

Outcomes measured

Modulator dynamic range
Signal bandwidth (20 MHz)
Oversampling ratio (OSR=10)
Power consumption (914 μW at 1.8 V)
Figure of merit (FoM)

View raw extracted JSON

{
  "study_type": "engineering",
  "exposure": {
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  },
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  "outcomes": [
    "Modulator dynamic range",
    "Signal bandwidth (20 MHz)",
    "Oversampling ratio (OSR=10)",
    "Power consumption (914 μW at 1.8 V)",
    "Figure of merit (FoM)"
  ],
  "main_findings": "A third-order continuous-time current-mode ΣΔ modulator for WLAN 802.11b applications is presented. The modulator is reported to achieve >60 dB dynamic range for 20 MHz signal bandwidth at OSR=10 while consuming 914 μW from a 1.8 V supply, with a calculated FoM indicating excellent performance.",
  "effect_direction": "unclear",
  "limitations": [],
  "evidence_strength": "insufficient",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "sigma-delta modulator",
    "continuous-time",
    "current-mode",
    "WLAN",
    "802.11b",
    "DAC coefficients",
    "current mirror integrator",
    "dynamic latch comparator",
    "low power",
    "GHz sampling rate"
  ],
  "suggested_hubs": []
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1016/j.jare.2013.06.003
PubMed: 25685504

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