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A transistor is a semiconductor device used to amplify or switch electrical signals and power. It is one of the basic building blocks of modern electronics. [1] It is composed of semiconductor material, usually with at least three terminals for connection to an electronic circuit.
Transistor models are used for almost all modern electronic design work. Analog circuit simulators such as SPICE use models to predict the behavior of a design. Most design work is related to integrated circuit designs which have a very large tooling cost, primarily for the photomasks used to create the devices, and there is a large economic incentive to get the design working without any ...
A circuit diagram representing an analog circuit, in this case a simple amplifier. Analog electronic circuits are those in which current or voltage may vary continuously with time to correspond to the information being represented. A simple schematic showing wires, a resistor, and a battery
Band diagram for NPN transistor at equilibrium Band diagram for NPN transistor in active mode, showing injection of electrons from emitter to base, and their overshoot into the collector. BJTs can be thought of as two diodes (p–n junctions) sharing a common region that minority carriers can move through.
Schematic of a basic SET and its internal electrical components. A single-electron transistor (SET) is a sensitive electronic device based on the Coulomb blockade effect. In this device the electrons flow through a tunnel junction between source/drain to a quantum dot (conductive island). Moreover, the electrical potential of the island can be ...
Top: source, bottom: drain, left: gate, right: bulk. Voltages that lead to channel formation are not shown. In field-effect transistors (FETs), depletion mode and enhancement mode are two major transistor types, corresponding to whether the transistor is in an on state or an off state at zero gate–source voltage.
A circuit diagram (or: wiring diagram, electrical diagram, elementary diagram, electronic schematic) is a graphical representation of an electrical circuit. A pictorial circuit diagram uses simple images of components, while a schematic diagram shows the components and interconnections of the circuit using standardized symbolic representations.
Figure 1: Basic NPN common collector circuit (neglecting biasing details). In electronics , a common collector amplifier (also known as an emitter follower ) is one of three basic single-stage bipolar junction transistor (BJT) amplifier topologies , typically used as a voltage buffer .