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Amplifier

Electronic circuit used to increase the amplitude of an electronic signal

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Amplification

Providing an output signal that is larger than the input

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 Common-base amplifier

Amplifier in which the base is common to both the input and output circuit.

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Common-emitter amplifier

Amplifier in which the emitter is common to both the input and output circuit

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Common-collector amplifier

Amplifier in which the collector is common to both the input and output circuit

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Degenerative Feedback

 A method of feeding back a portion of a signal to decrease the amplification

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Class A amplifier

Amplifier biased so that current flows throughout the entire cycle

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Class AB amplifier

Amplifier biased so that current flows for less than a full but more than a half cycle

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Class B amplifier

Amplifier biased so that current flows for only one-half of input cycle

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Class C amplifier

Amplifier biased so that current flows for less than half of input cycle

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Coupling

Joining of two amplifier circuits together

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Direct coupled amplifier

Provides amplification of low frequencies to DC voltage

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Differential amplifier

Amplifier that subtracts one signal from another

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Audio amplifier

Amplifies AC signals in the audio range of 20 to 20,000 Hz

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Voltage amplifier

An audio amplifier to produce a high gain

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Power amplifier

An audio amplifier designed to drive a specific load

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Video amplifier

Wideband amplifiers used to amplify video signals to 6 MHz

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RF amplifier

Amplifies signals of 10,000 to 30,000 MHz

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Operational amplifier

A very high gain DC amplifier op-amp

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Summing amplifier

Used when mixing audio signals together

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Differential amplifier

Amplifier with two separate inputs and one or two outputs