power amplifier


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power amplifier

[′pau̇·ər ¦am·plə‚fī·ər]
(electronics)
The final stage in multistage amplifiers, such as audio amplifiers and radio transmitters, designed to deliver maximum power to the load, rather than maximum voltage gain, for a given percent of distortion.

Power amplifier

The final stage in multistage amplifiers, such as audio amplifiers and radio transmitters, designed to deliver appreciable power to the load. Power amplifiers may be called upon to supply power ranging from a few watts in an audio amplifier to many thousands of watts in a radio transmitter. In audio amplifiers the load is usually the dynamic impedance presented to the amplifier by a loudspeaker, and the problem is to maximize the power delivered to the load over a wide range of frequencies. The power amplifier in a radio transmitter operates over a relatively narrow band of frequencies with the load essentially a constant impedance. See Amplifier

power amplifier

A unit in a transmitter that receives signals from a modulator and amplifies their power (in stages, if necessary) to a transmission level.
References in periodicals archive ?
The players contributing to the small cell power amplifier market include TekTelic Communication Inc.; Skyworks Solution; RFHIC Corp; Qorvo Inc.; Anadigics Inc.; Broadcom Corporation; Texas Instruments; and NXP Semiconductors.
The previous world record for power amplifier output density in the W-band for transmitters was 3.6 watts per millimeter of gate width with technology developed by Fujitsu Laboratories.
The broadband power amplifier was implemented on a Rogers substrate with the dielectric constant of 3.66 and thickness of 0.762 mm, as shown in Figure 8.
(2015) High-Efficiency Harmoic-Peaking Class-EF Power Amplifiers with Enhanced Maximum Operating Frequency.
In this study, we proposed a mode-locking technique for a cascode CMOS power amplifier. Using the drain voltage of a common-source transistor as the input of the cross-coupled transistor, the time delay between the common-source and cross-coupled transistors was minimized to maximize the advantage of the mode-locking technique.
The characteristic impedances of the offset lines and the phase compensation lines of the proposed conventional Doherty power amplifier are all 50[ohm], the widths are 1.69mm (66.37mil).
In general, the power stage of the switching-mode power amplifier is designed using class-E or class-F types so as to obtain watt-level output power [10].
To maximize efficiency, modern wide-band power amplifiers must operate in a nonlinear region.
ParkerVision is offering two families of RF power amplifier products - the vector power amplifier (VPA) and digital power amplifier (DPA).
Over the years, tutorials have appeared in EMC journals explaining how to estimate the power required from a power amplifier intended for use in an RF immunity test system.
Other applications include power amplifier biasing for RF, audio and amplifiers that require gain or phase control.

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