Title :
Stability analysis of an autonulling AC bridge for use with silicon-based sensors
Author :
Bey, Paul P., Jr. ; Yonce, David J. ; Fare, Thomas L.
Author_Institution :
Center for Bio/Molecular Sci. & Eng., Naval Res. Lab., Washington, DC, USA
fDate :
3/1/1994 12:00:00 AM
Abstract :
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
Keywords :
bridge circuits; bridge instruments; closed loop systems; electric sensing devices; feedback; linearisation techniques; nonlinear differential equations; nonlinear network analysis; perturbation techniques; stability criteria; transient response; Si-based sensors; autonulling AC bridge; discrete components; integral feedback; integrated circuits; nonlinear coupled differential equations; nonlinear feedback network; null point; numerical integration; perturbation method; stability analysis; transient impedance changes; transient response; Bridge circuits; Circuit stability; Circuit testing; Coupling circuits; Differential equations; Feedback circuits; Impedance measurement; Perturbation methods; Prototypes; Stability analysis;
Journal_Title :
Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on
