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Efficiency |
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CMOS Introduction CMOS Amplifier Amplifier characteristics Gain Output dynamic range Bandwidth and rise time Settling time and aberrations Slew rate Noise Efficiency Linearity Electronic amplifiers Two-Stage Amplifier Design Of OP-AMP Design Of Two Stage OP-AMP |
Efficiency is a measure of how much of the input power is usefully applied to the amplifier's output. Class A amplifiers are very inefficient, in the range of 10–20% with a max efficiency of 25%. Class B amplifiers have a very high efficiency but are impractical because of high levels of distortion. In practical design, the result of a tradeoff is the class AB design. Modern Class AB amps are commonly between 35–55% efficient with a theoretical maximum of 78.5%. Commercially available Class D switching amplifiers have reported efficiencies as high as 97%. The efficiency of the amplifier limits the amount of total power output that is usefully available.
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