Audio amplifiers are essential in audio systems, designed to increase weak audio signals to drive speakers and produce sound. While each type of amplifier boosts audio, the way they handle signals, manage heat, and affect audio quality varies significantly, leading to different classes of amplifiers with unique advantages and trade-offs. The main amplifier types—Class A, B, AB, and D—offer differences in sound fidelity, efficiency, and practicality which may affect which design is best according to various audio applications.
But the general performance needs are still the same across amplifier types. How well does the device filter for noise? What's the frequency response? Is the gain linear? Evaluating these performance metrics requires rigorous testing, and that's where the very nuanced measurement tactics and tools for amplifiers come into play.
Application Note: Testing Power Amplifiers
Power amplifiers present a unique set of testing challenges that are usually not encountered when working with digital or low-level analog circuits, due to the fact that they must supply significant current as well as voltage to their loads. Factors such as power supply current and voltage limitations, thermal characteristics of the output devices and associated heatsinks, and the resistive and reactive components of the load must be considered during testing to produce meaningful results.This paper covers the fundamental measurements for testing power amplifiers, with specifics on how to best accomplish the tests using APx hardware and software.
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Measuring Switch-ModePower Amplifiers
Switch-mode audio power amplifiersbecame popular due to their smallersize, lower weight, and improvedefficiency. While they have advantagesin low-power, battery-operateddevices like laptops and personalaudio players, switch-mode amplifiersare also progressively displacing moretraditional linear designs inmainstream applications where high-quality audio is important.
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Measuring Switch-ModePower Amplifiers
Switch-mode audio power amplifiersbecame popular due to their smallersize, lower weight, and improvedefficiency. While they have advantagesin low-power, battery-operateddevices like laptops and personalaudio players, switch-mode amplifiersare also progressively displacing moretraditional linear designs inmainstream applications where high-quality audio is important.
立即下载
Measuring Switch-ModePower Amplifiers
Switch-mode audio power amplifiersbecame popular due to their smallersize, lower weight, and improvedefficiency. While they have advantagesin low-power, battery-operateddevices like laptops and personalaudio players, switch-mode amplifiersare also progressively displacing moretraditional linear designs inmainstream applications where high-quality audio is important.
立即下载
Measuring Switch-ModePower Amplifiers
Switch-mode audio power amplifiersbecame popular due to their smallersize, lower weight, and improvedefficiency. While they have advantagesin low-power, battery-operateddevices like laptops and personalaudio players, switch-mode amplifiersare also progressively displacing moretraditional linear designs inmainstream applications where high-quality audio is important.
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Test Jig GRAS Acoustics RA0052
The GRAS RA0052 is for use withGRAS couplers and artificial ears. Ithas an adjustable spring-loaded armto exert a variable force on the test object.
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Testing Audio Power Amplifiers with APx Analyzers
In this session, Audio Precision General Manager and industry expert Daniel Knighten provides insights into the fundamental measurements needed for designing and manufacturing audio power amplifiers. Whether you're new to testing audio power amplifiers or want to deepen your understanding of the fundamental measurements used to test these devices in APx analyzers, this webinar will equip you with valuable information.
功放测试常见问题
Features in the APx500 measurement software that support the creation of automated production test sequences include:
Sequence Mode
Sequences & the Navigator/Sequencer
Signal Paths, Measurements, and Sequence Steps
Variables
Auxiliary control
Data export and report generation
Microphone calibration
Output level regulation
Defining limits/targets using a Golden Unit (reference device)
Analog generator Global Vmax
Input equalization
Production Test mode (password-restricted)
Sequence logging and statistics