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CHAPTER 2. 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.
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 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:
Power amplifiers are bulk. Due to the non–linear characteristics of transistors, Harmonic Distortions are available at the output. Performance parameters: The performance of power amplifiers are determined by the following points. 1. Circuit efficiency: Also known as conversion efficiency or overall efficiency.
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
Amplifiers are used to increase the amplitude of a voltage or current, or to increase the amount of power available usually from an AC signal. Whatever the task, there are three categories of amplifier that relate to the properties of their output; 1. Voltage amplifiers. 2. Current amplifiers. 3. Power amplifiers.
