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A Chopper Current-Feedback Instrumentation Amplifier With a 1 mHz <formula formulatype="inline"><tex Notation="TeX">$1/f$</tex> </formula> Noise Corner and an AC-Coupled Ripple Reduction Loop

Open access
Wu, Rong, Makinwa, Kofi A. A., Huijsing, Johan H.·2009·IEEE Journal of Solid-State Circuits

Abstract

This paper presents a chopper instrumentation amplifier for interfacing precision thermistor bridges. For high CMRR and DC gain, the amplifier employs a three-stage current-feedback topology with nested-Miller compensation. By chopping both the input and intermediate stages of the amplifier, a 1 mHz 1/fnoise corner was achieved at an input-referred noise power spectral density (PSD) of 15 nV/¿Hz. To reduce chopper ripple, the amplifier employs a continuous-time AC-coupled ripple reduction loop. Due to its continuous-time nature, the loop causes no noise folding to DC and hence offers improved noise performance over auto-zeroed amplifiers. The loop reduces chopper ripple by more than 60 dB, to levels below the amplifier's own input-referred noise. Furthermore, a maximum input referred offset of 5 ¿ V and a CMRR greater than 120 dB were measured at a supply current of 230 ¿A at 5 V.

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Metadata

Authors
Wu, R., Makinwa, K. A. A., & Huijsing, J. H.
Venue
IEEE Journal of Solid-State Circuits
Published
2009-12
Volume
44
Issue
12
Pages
3232-3243
ISSN
  • 0018-9200 (ISSN-L)
  • 1558-173X
OpenAlex
W2101394360
Cited by
288
References
6
FWCI
9.70
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: A Chopper Current-Feedback Instrumentation Amplifier With a 1 mHz <formula formulatype="inline"><tex Notation="TeX">$1/f$</tex> </formula> Noise Corner and an AC-Coupled Ripple Reduction Loop. https://app.cochat.ai/papers/10.1109/jssc.2009.2032710
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Wu, R., Makinwa, K. A. A., & Huijsing, J. H. (2009). A Chopper Current-Feedback Instrumentation Amplifier With a 1 mHz <formula formulatype="inline"><tex Notation="TeX">$1/f$</tex> </formula> Noise Corner and an AC-Coupled Ripple Reduction Loop. IEEE Journal of Solid-State Circuits. https://doi.org/10.1109/jssc.2009.2032710

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.