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Power amplifier circuits (output stages) are classified as A, B, AB and C for linear designs—and class D and E for switching designs. The classes are generally based on the proportion of each input cycle (conduction angle) during which an amplifying device passes current. [2]
In practical design, the result of a tradeoff is the class AB design. Modern Class AB amplifiers commonly have peak efficiencies between 30 and 55% in audio systems and 50-70% in radio frequency systems with a theoretical maximum of 78.5%. Commercially available Class D switching amplifiers have reported efficiencies as high as 90%. Amplifiers ...
Some classes are class A, class AB, class B, which are considered the linear amplifier classes in which the active device is used as a controlled current source, while class C is a nonlinear class in which the active device is used as a switch. The bias at the input of the active device determines the class of the amplifier.
A practical amplifier circuit. The practical amplifier circuit shown above could be the basis for a moderate-power audio amplifier. It features a typical (though substantially simplified) design as found in modern amplifiers, with a class-AB push–pull output stage, and uses some overall negative feedback. Bipolar transistors are shown, but ...
A linear amplifier is an electronic circuit whose output is ... class-AB power amplifiers or other variations are used with some ... With careful design of PA ...
This potentially simplifies the design and implementation of a stable class AB amplifier, reducing the need for emitter resistors. [4] This significantly reduces the number of components which must be in thermal contact with the heatsink and reduces the likelihood of thermal runaway.
Designers of purely solid-state class AB amplifiers with global negative feedback claimed closed-loop THD of no more than 0.003% throughout the audio range. [16] Lowest distortion buffer amplifiers employ a combination of a voltage operational amplifier and an off-the-shelf diamond buffer IC, enclosed in a common negative feedback loop. [12 ...
Class-A amplifier, class-B amplifier, class-AB amplifier, (audio amplifiers) Height: 4.25 in (108 mm) Diameter: 1.438 in (36.5 mm) Cathode; Cathode type: Indirectly heated: Heater voltage: 6.3: Heater current: 900 mA: Anode; Max dissipation Watts: 30: Max voltage: 500 Specification listed is for type 6L6-GC: Socket connections