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Amplifier

An amplifier is an electronic circuit containing transistors or integrated circuits that provide a voltage gain. It may also provide a current gain, power gain, or impedance transformation. Amplifiers are used to manipulate various signals within a circuit. Since it is a basic part of almost every electronic application, the amplifier is an essential circuit that is used in numerous applications. Generally, amplifiers are employed in applications where the voltage or current of a signal needs to be increased. Audio amplifiers operate by increasing the power of signals in the audible frequency range prior to delivery to an appropriate acoustic transducer (speaker). It is often desirable to amplify audio signals using a Class D switching audio amplifier. Class D amplifiers are substantially more efficient than non-switching linear amplifiers. Basic circuit layout of the Class D amplifier is substantially similar to that of linear amplifiers, such as Class A, B, and AB, with a major difference being in the signals provided to an output stage. Signal amplifiers are used in many applications and may include amplifiers used for buffering or otherwise amplifying AC signals, as well as buffering or otherwise amplifying DC signals. One particular example of amplifiers used for DC signals includes those amplifiers used for generating reference voltages. Amplifiers are often used in integrated circuit design. An amplifier makes use of power from a DC power supply to produce an output signal having its voltage and/or current increased with respect to that of an input signal. Specialized amplifiers known as operational amplifiers exhibit extremely high voltage gain, high input impedance, and low output impedance. Operational amplifiers are widely used in electronic circuits to amplify signals. An operational amplifier (op amp) is a high gain electronic amplifier having its gain controlled by negative feedback. An operational amplifier is basically a differential amplifier that amplifies the difference between the two inputs. Differential amplifiers are used to amplify differential inputs, usually small signal differentials, at any given common mode of operation. Differential amplifiers sense two input signals and output a signal that is a function of the difference in values of the two input signals. One type of differential amplifier employs complementary metal-oxide semiconductor (CMOS) integrated circuits. With the increasing growth of wireless communications, radio frequency (RF) amplifiers are finding use in many new and varied applications. Digital communications devices including digital voice, for example digital cellular phones, and digital data such as computer networking transmit RF energy to communicate. These devices often require highly linear RF power amplifiers to operate properly. Wireless communication devices (such as cellular phones) use power amplifiers to amplify and transmit radio frequency (RF) signals. Variable gain amplifiers are frequently used in modern radio receivers to amplify or attenuate incoming signals to properly drive an associated analog-to-digital converter (A/D). Typically, the variable gain is distributed among radio frequency (RF), intermediate frequency (IF), and low-frequency or baseband circuits. A low noise amplifier (LNA) is a common device used to filter out the noise of input signals received at the front ends of communication systems.

categoryAmplifier categories


Differential amplifier Differential amplifier (0)

Low noise amplifier (LNA) Low noise amplifier (LNA) (0)

Microwave amplifier Microwave amplifier (0)

Operational amplifier Operational amplifier (0)

Servo amplifier Servo amplifier (0)

Variable gain amplifier (VGA) Variable gain amplifier (VGA) (0)




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