Active and Passive - Devices Essay Example for Free

Active and Passive Devices EssayElectronic components are classed into all being Passive windings or Active devices. Active devices are different from passive devices. These devices are capable of changing their operational performance, may deliver advocate to the circuit, and stool perform interesting mathematical functions. While a device that does not require a source of energy for its operation.Active DevicesAn combat-ready device is any type of circuit component with the ability to electrically control electron flow (electricity autocratic electricity). In order for a circuit to be properly called electronic, it must contain at least one active device. Active devices include, but are not limited to, vacuum tubes, transistors, silicon-controlled rectifiers (SCRs), and TRIACs. All active devices control the flow of electrons through them. Some active devices allow a voltage to control this current period other active devices allow another(prenominal) current to do the job. Devices utilizing a static voltage as the controlling betokenise are, not surprisingly, called voltage-controlled devices. Devices working on the principle of one current controlling another current are known as current-controlled devices. For the record, vacuum tubes are voltage-controlled devices while transistors are made as either voltage-controlled or current controlled types. The starting type of transistor successfully demonstrated was a current-controlled device.What are Passive Devices?Components incapable of controlling current by means of another electrical signal are called passive devices. Resistors, capacitors, inductors, transformers, and even diodes are all considered passive devices. Passive devices are the resistors, capacitors, and inductors required to build electronic hardware. They always have a acquit less than one, thus they can not oscillate or amplify a signal. A combination of passive components can multiply a signal by values less than one, they can shift the phase of a signal, they can reject a signal because it is not made up of the recompense frequencies, they can control complex circuits, but they can not multiply by more than one because they lack gain.INTEDGRATED CIRCUITSAnalog circuitsMost parallel electronic appliances, such as radio receivers, are constructed from combinations of a few types of basic circuits. Analog circuits use a endless range of voltage as contrasted to discrete levels as in digital circuits. The form of different analog circuits so far devised is huge, especially because a circuit can be delimitate as anything from a single component, to trunks containing thousands of components. Analog circuits are sometimes called linear circuits although many non-linear effects are used in analog circuits such as mixers, modulators, etc. Good examples of analog circuits include vacuum tube and transistor amplifiers, operational amplifiers and oscillators. One rarely finds modern circuits that are ent irely analog. These days analog circuitry may use digital or even microprocessor techniques to improve performance.This type of circuit is usually called mixed signal rather than analog or digital. sometimes it may be difficult to differentiate between analog and digital circuits as they have elements of both linear and non-linear operation. An example is the comparator which takes in a continuous range of voltage but only outputs one of two levels as in a digital circuit. Similarly, an overdriven transistor amplifier can take on the characteristics of a controlled switch having essentially two levels of output.* A dorm effect sensor is a transducer that varies its output voltage in response to a magnetic field. Hall effect sensors are used for proximity switching, positioning, speed detection, and current sensing applications. * A current sensor is a device that detects electrical current (AC or DC) in a wire, and generates a signal proportional to it.The generated signal could be analog voltage or current or even digital output.It can be then utilized to display the measured current in an ammeter or can be stored for further analysis in a entropy acquisition system or can be utilized for control purpose.Digital circuitsDigital circuits are electric circuits based on a number of discrete voltage levels. Digital circuits are the most common physical representation of Boolean algebra, and are the basis of all digital computers. To most engineers, the impairment digital circuit, digital system and logic are interchangeable in the context of digital circuits. Most digital circuitsuse a binary system with two voltage levels labeled 0 and 1. Often logic 0 will be a lower voltage and referred to as Low while logic 1 is referred to as High. However, some systems use the reverse definition (0 is High) or are current based. Ternary (with three states) logic has been studied, and some persona computers made. Computers, electronic clocks, and programmable logic contr ollers (used to control industrial processes) are constructed of digital circuits. Digital signal processors are another example.http//aanaedwards.hubpages.com/hub/Active-Passive-Devices 2011 Aana Edwards Silicon City, CAhttp//en.wikipedia.org/wiki/Electronics