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Class-A amplifiers may be used in output stages of op-amps [11] (although the accuracy of the bias in low cost op-amps such as the "741" may result in class A or class AB or class B performance, varying from device to device or with temperature). They are sometimes used as medium-power, low-efficiency, and high-cost audio power amplifiers.
One way to use total system power to get a more accurate estimate of power is to consider the amplifier class which would give an educated guess of the power output by considering the efficiency of the class. For example, class AB amplifiers can vary widely from 25% to 75% efficiency while Class D amps are much higher at 80% to 95%.
Pin 5 – Grid 1 (control) Pin 6 – n.c Pin 7 – Heater . Pin 8 – Cathode & beam-forming plates: Typical class-A amplifier operation; Anode voltage: 350 V: Anode current: 54 mA: Screen voltage: 250 V: Bias voltage: −18 V: Anode resistance: 5 kOhms: Typical class-AB amplifier operation (Values are for two tubes) Power output: 55 W: Anode ...
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 ...
In the 1970s and 1980s, most PAs employed heavy class AB amplifiers. In the late 1990s, power amplifiers in PA applications became lighter, smaller, more powerful, and more efficient, with the increasing use of switching power supplies and class D amplifiers, which offered significant weight- and space-savings as well as increased efficiency ...
This means that class AB and B amplifiers produce their lowest distortion percentage at near maximum amplitude, with poorer distortion performance at low levels. As the circuit changes from pure class A, through AB1 and AB2, to B, open-loop crossover distortion worsens. Class AB and B amplifiers use NFB to reduce open-loop distortion.
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- 3579 S High St, Columbus, OH · Directions · (614) 409-0683