A 16 b Multi-Step Incremental Analog-To-Digital Converter with Single-Opamp Multi-Slope Extended Counting

Yi Zhang*, Chia-Hung Chen, Tao He, Gabor C. Temes

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

This paper presents a multi-step incremental analog-To-digital converter (IADC) using multi-slope extended counting. Only one active integrator is used in the three-step conversion cycle. The accuracy of the IADC is extended by having it configured asmulti-slope ADCs in two additional steps. The proposed IADC uses the same circuitry as a first-order IADC (IADC1), but it exhibits better performance than a second-order IADC. For the same accuracy, the conversion cycle is shortened by a large factor (by more than 29 for the implemented device) compared with that of a conventional single-step IADC1. Fabricated in 0.18 μm CMOS process, the prototype ADC occupies 0.5 mm2. With a 642 kHz clock, it achieves an SNDR of 52.2 dB in the first step. The SNDR is boosted to 79.8 dB in the second step and to 96.8 dB in the third step, over a 1 kHz signal band. The power consumption is 35 μW from a 1.5 V power supply. This gives an excellent Schreier figure of merit of 174.6 dB.

Original languageEnglish
Article number7833069
Pages (from-to)1066-1076
Number of pages11
JournalIEEE Journal of Solid-State Circuits
Volume52
Issue number4
DOIs
StatePublished - 1 Apr 2017

Keywords

  • chopper stabilization
  • extended counting
  • incremental ADC (IADC)
  • instrumentation and measurement
  • multi-slope ADCs
  • multi-step operation
  • sensor interface circuits
  • ΔΣ analog-To-digital converter (ADC)

Fingerprint

Dive into the research topics of 'A 16 b Multi-Step Incremental Analog-To-Digital Converter with Single-Opamp Multi-Slope Extended Counting'. Together they form a unique fingerprint.

Cite this