Category Archive for: POWER AMLIFIERS

AMPLIFIER CLASSES AND EFFICIENCY

Class-A Amplifiers All the small-signal amplifiers we have studied in this book have been designed so that output voltage can vary in response to both positive and negative inputs; that is, the are biased so that under normal operation the output never saturates or cuts off. An amplifier that has that property is called a class-A amplifier. More precisely…

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Derating

The maximum permissible power dissipation of a semiconductor device is specified  the . at a certain temperature either case temperature or ambient temperature. For example the maximum power dissipation of a power transistor may be given as 10 W at 25°C ambient, and that of another device as 20 W at 50°C case tempera ratings mean that each device…

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HEAT TRANSFER IN SEMICONDUCTOR DEVICES

Conduction Radiation and Convection Heat transfer takes place by one or more of three fundamental mechanisms: conduction radiation, and convection as illustrated in Figure 16-3. Conduction occurs when the energy that the atoms of a material acquire through heating is transferred to adjacent less energetic atoms in a cooler region of the material. For example conduction is the process…

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POWER AMLIFIERS

DEFINITIONS APPLICATIONS AND TYPES OF POWER AMPLIFIERS As the name implies, a power amplifier is designed to deliver a large amount of power to a load. To perform this function, a power amplifier must itself be capable of dissipating large amounts of power; that is, it must be designed so that the heat generated when it is operated…

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