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4 Concluding Remarks The behavior of controlled plants around an operating point can in general be described by linear dynamic models. Linear dynamic models are characterized in the time domain by linear differential equations and in the frequency domain by transfer functions. Control systems are closed-loop systems that contain the plant, the controller and the feedback connection. For these systems, the control applied to the plant is a function of the difference between the desired value and the measured value of the controlled variable.

5. 2) The filters used are known as “anti-aliasing filters”. A good anti-aliasing filter must have a minimum of two cascaded second-order cells (fmax << (1/2) fs). 6. These filters must introduce a large attenuation at frequencies higher than (1/2) fs, but their bandwidth must be higher than the required bandwidth of the closed loop system (generally higher than open loop system bandwidth). Circuits of this type (or more complex) are currently available. 6. Anti-aliasing filter → Computer Control Systems 31 In the case of very low frequency sampling, first a sampling at a higher frequency is carried out (integer multiple of the desired frequency), using an appropriate analog anti-aliasing filter.

5. 2) The filters used are known as “anti-aliasing filters”. A good anti-aliasing filter must have a minimum of two cascaded second-order cells (fmax << (1/2) fs). 6. These filters must introduce a large attenuation at frequencies higher than (1/2) fs, but their bandwidth must be higher than the required bandwidth of the closed loop system (generally higher than open loop system bandwidth). Circuits of this type (or more complex) are currently available. 6. Anti-aliasing filter → Computer Control Systems 31 In the case of very low frequency sampling, first a sampling at a higher frequency is carried out (integer multiple of the desired frequency), using an appropriate analog anti-aliasing filter.

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