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notes-326-set2 - ELEC 326 Kartik Mohanram Handed out on...

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ELEC 326 Kartik Mohanram Handed out on Thursday, August 27 th , 2009 1 Objectives The circuits studied in this course are examples of electrical systems. Therefore, these notes will primarily provide an introduction to the general properties and characteristics of electrical systems, explain the role of system models in the analysis and synthesis of electrical systems, and give a brief introduction to digital systems. I encourage all of you to read Chapter 1 in the textbook. This is a general introduction to the area of digital design that should be viewed as introductory material augmenting these notes. 1.1 What is a system? A system is a collection of devices assembled to perform a useful transformation of information. Information is presented to a system’s input terminals in the form of time-varying signals. Changes in a system’s input signals can produce changes in its output signals after some delay (controlling this delay is at the core of all system design). Systems may contain internal memory used to save information for future use. The value of a system’s output signal is determined by the values of the system’s input signals and the informa- tion in its internal memory. The values of the output signals are determined by some rule or algorithm that can be physically implemented. If a system has memory, it can have two or more di ff erent output values for the same input value. 1.2 System models A system model is a simplified description of one or more properties of a system. Models predict how a system will react to changes in its input signals. Models predict system behavior without building a physical instance of the system. A single model never represents all of the physical properties of a system, and therefore cannot exactly predict a system’s behavior.
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