Stability analysis of an autonulling AC bridge for use with silicon-based sensors

A novel circuit incorporating integral feedback to automatically null an AC bridge is analyzed and discussed. Stability of the feedback scheme is examined by linearizing the system near the critical point (null) of the bridge using a standard perturbation method. Solutions of the nonlinear coupled d...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. 1, Fundamental theory and applications Fundamental theory and applications, 1994-03, Vol.41 (3), p.210-219
Main Authors: Bey, P.P., Yonce, D.J., Fare, T.L.
Format: Article
Language:English
Subjects:
Analog circuits
Applied sciences
Bridge circuits
Circuit properties
Circuit stability
Circuit testing
Coupling circuits
Differential equations
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Feedback circuits
Impedance measurement
Perturbation methods
Prototypes
Stability analysis
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Summary:A novel circuit incorporating integral feedback to automatically null an AC bridge is analyzed and discussed. Stability of the feedback scheme is examined by linearizing the system near the critical point (null) of the bridge using a standard perturbation method. Solutions of the nonlinear coupled differential equations that describe the operation of the autonulling AC bridge were obtained by numerical integration. A prototype was constructed using integrated circuits and discrete components to measure the transient response; test results of the circuit from transient impedance changes are compared to the time-dependent numerical solutions.< >
ISSN:1057-7122
1558-1268
DOI:10.1109/81.273920