On the Stability of Shield-Driver Circuits

This paper analyzes the stability of shield-driver circuits (SDCs) applied to the measurement of remote signal sources (such as bioelectric signals) and then proposes design ideas to guarantee it. According to the performed analysis, there are at least two factors that explain the potential instabil...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2010-02, Vol.59 (2), p.458-462
Main Authors: Spinelli, Enrique Mario, Reverter, Ferran
Format: Article
Language:English
Subjects:
Active shielding
Bioelectric phenomena
Cables
Circuit analysis
Circuit stability
Circuits
Design engineering
Electric potential
Enginyeria electrònica
Inductance
Instability
Instrumentació
Instrumentació i mesura
Instrumentation
Mesurament
Performance analysis
shield-driver circuit (SDC)
shielded cable
Signal analysis
Signal design
Stability
Stability analysis
Transfer functions
Àrees temàtiques de la UPC
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Description
Summary:This paper analyzes the stability of shield-driver circuits (SDCs) applied to the measurement of remote signal sources (such as bioelectric signals) and then proposes design ideas to guarantee it. According to the performed analysis, there are at least two factors that explain the potential instability of the SDC: 1) a high order of the SDC transfer function and 2) the parasitic inductance of the interconnecting cable. The former makes the circuit unstable for intermediate values of the output resistance RS of the signal source, whereas the latter makes the circuit unstable for low values of RS . These theoretical predictions are experimentally validated using several commercial operational amplifiers.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2009.2024698