The first-page abstract and the discussion of low-pass filter design explain why signal and reference filters must have matching responses to retain excitation-noise cancellation.
Additional cited passages: §§3.1–3.2, printed pp. 6–9, Figures 3-1–3-4, resistance-decade-box noise tests comparing reference-only filtering with matched signal/reference filters. The mismatched-filter experiment uses 1 mA excitation, a 2 kΩ reference, gain eight and 20 samples per second. [ref]
Additional cited passage: §3.4, printed p. 11, and Table 3-1, electrical settling after excitation activation and before acquisition; the table expresses resolution-dependent settling requirements in RC time constants. [ref]

Articles by others on the same topic (0)

There are currently no matching articles.