## Principles of feedback control |

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### Contents

Introduction | 1 |

Selected Topics in Linear Differential Equation | 9 |

The Response and Error Functions of Feedback | 34 |

Copyright | |

12 other sections not shown

### Common terms and phrases

amplifier amplitude analysis approximately asymptotes bandwidth block diagram Chapter characteristic equation closed-loop system coefficients complex number components computation constant contour corresponding curve describing function determined differential equation encircle equal example factor feedback function feedback system frequency response GH(s give given in Eq imaginary axis impulse integral Laplace transform lead compensator left half-plane limit cycle linear system locus logarithmic coordinates loop gain M-criterion marginal stability minor loop multiple-loop system negative nonlinear element Nyquist criterion Nyquist diagram Nyquist method Nyquist theorem obtained open-loop transfer function output parameter per-unit critical damping phase margin plot pole-zero poles and zeros positive problem rational function real axis right half-plane root location root loci root-locus diagram Routh s-plane sampled signal sampler sampling shown in Fig signal simple single-loop systems sinusoidal solution stability margin steady-state error step input system roots theorem tion trajectory transient response unstable variable variation velocity z-transform zero-order hold