The Zoom ADC: An Evolving Architecture

Efraïm Eland*, Shubham Mehrotra, Shoubhik Karmakar, Robert van Veldhoven, Kofi A.A. Makinwa

*Corresponding author for this work

Research output: Chapter in Book/Conference proceedings/Edited volumeChapterScientificpeer-review

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Abstract

Zoom ADCs combine a coarse SAR ADC with a fine delta-sigma modulator (?SM) to efficiently obtain high energy efficiency and high dynamic range. This makes them well suited for use in various instrumentation and audio applications. However, zoom ADCs also have drawbacks. The use of over-ranging in their fine modulators may limit SNDR, large out-of-band interferers may cause slope overload, and the quantization noise of their coarse ADC may leak into the baseband. This chapter presents an overview of recent advances in zoom ADCs that tackle these challenges while maintaining high energy efficiency. Prototypes designed in standard 0.16 µm technology achieve SNDRs over 100 dB in bandwidths ranging from 1 to 24 kHz while consuming only hundreds of µWs.

Original languageEnglish
Title of host publicationBiomedical Electronics, Noise Shaping ADCs, and Frequency References
Subtitle of host publicationAdvances in Analog Circuit Design 2022
PublisherSpringer
Pages179-201
Number of pages23
ISBN (Electronic)9783031289125
ISBN (Print)9783031289118
DOIs
Publication statusPublished - 2023

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

  • Asynchronous
  • Auto-zeroing
  • Calibration
  • Capacitive DAC
  • Chopping
  • Common-Mode Feedback (CMFB)
  • Common-mode Rejection Ratio (CMRR)
  • Correlated Double Sampling (CDS)
  • Data Weighted Averaging (DWA)
  • Delta Sigma Modulator
  • Dynamic zoom ADC
  • Finite Impulse Response (FIR)
  • Floating current source
  • Inverter-based
  • Linearity
  • Loop filter
  • MASH
  • Negative resistance
  • Noise Transfer Function (NTF)
  • Non-Return-to-Zero (NRZ)
  • Operational Transconductance Amplifier (OTA)
  • Pseudo-differential
  • PVT
  • Quantization noise leakage
  • Return-to-Zero (RZ)
  • SAR ADC
  • SQNR
  • Stability
  • Tail impedance
  • Tail-Resistor-Linearized (TRL)
  • Zoom ADC

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