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Class A Amplifiers
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Class A amplifier designs are output stage devices that pass currents at all times, even when the input stage is idle. Since the output stages are always "active", presence of an input signal causes output current to be diverted directly to the loudspeakers. The slew rate is very quick and there is only a small delay between the introduction of signal at the amplifier's inputs and outputs. If all stages of the amplifier are biased in Class A mode, and the amplifier produces all currents at its output, regardless of input signal. Because of the full-bias-current-on state of Class A amplifiers, they are the most inefficient of all designs; however, Class A amplifiers are the most linear. Products & Services
Power operational amplifiers (POA) are used to increase the power of low-level signals in applications that drive low impedances or reactive loads. They dissipate excess energy as heat, deliver extensive current, and can sustain relatively high supply voltages.
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Video amplifier chips are used in circuits to process video signals.
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Current sense amplifiers are integrated circuits with operational amplifiers and sense resistors that are used in measuring the amplitude and direction of current in circuits.
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Operational amplifiers (op amps, op-amps) are general-purpose, closed-loop devices that are used to implement linear functions.
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Topics of Interest
Class AB amplifiers are a combination of Class A and Class B operations. Amplifiers are said to be in Class AB operation if the amplifier operates in Class A for part of its output, and turns on an...
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The Entire Amplifier
Having looked at the problems of the output stage, we can now consider the support circuitry in detail. The output stage is insufficiently sensitive to be driven directly from a...
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3.7 Amplifier Classes and Operation
In the previous discussions we assumed that for every portion of the input signal there was an output from the amplifier. This is not always the case with all...
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3.7 Amplifier Classes and Operation
In the previous discussions we assumed that for every portion of the input signal there was an output from the amplifier. This is not always the case with all...
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3.3 Amplifier Biasing
3.3.1 Introduction
Classes of operation. Special classes of amplifier bias levels are utilized to achieve different objectives, each with its own distinct advantages and...
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