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POWER AMPLIFIER. 2.0 Introduction. The main characteristics of an amplifier are Linearity, efficiency, output power, and signal gain. In general, there is a trade off between these characteristics. For example, improving amplifier’s linearity will degrade its efficiency.
Radio frequency amplifiers used in transmitters can be required to produce thousands of kilowatts of output power, and DC amplifiers used in electronic control systems may also need high power outputs to drive motors or actuators of many different types.
Power amps require a large-signal design methodology: Δ V and Δ I are significant compared with V DQ and I DQ . Power Amp Objective: Get the largest Δ V and Δ I without:
Calculate input power, output power and efficiency of the amplifier circuit for the circuit shown below for an input voltage that increases the base current by 10mA peak.
power amplifiers. Describe the characteristics of amplifiers, including classes of operation, types of coupling, and frequency ranges. Draw a schematic of class B/AB push-pull amplifier and explain its operation. Determine the efficiency of transistor power amplifiers. Discuss the factors that limit the power rating of a transistor and
power amplifier can be regarded as complete until it has proper DC protection – having an amplifier fail is bad enough, but having it fail and take an expensive loudspeaker with it is downright upsetting.
The main features of a large-signal amplifier or power amplifier are the circuit’s power efficiency, the maximum amount of power that the circuit is capable of handling and the im- pedance matching to the output device.
