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AUX-0025 / 0040 / 0100 Switching ... - Audio Precision
https://www.ap.com/analyzers-accessories/accessories/aux-family-switching-amplifier-measurement-filters/
Providing signal preconditioning for measurement accuracy in Class-D amplifier test. The Audio Precision AUX-0025 / 0040 / 0100 switching amplifier measurement filters are designed to be inserted between the device under test and an analyzer input, to reduce out-of-band switching signal components before measurement.
Optimizing Class-D Audio Amplifier Output Filters
https://passive-components.eu/optimizing-class-d-audio-amplifier-output-filters/
The output LC filter is a critical element in determining the size, sound quality, and efficiency of a Class-D sound system. The output filter is designed to attenuate the high frequency switching component while passing the audio frequency band of 20 Hz to 20 kHz. One low-pass LC filter is needed for each audio channel.
Class D Audio Amplifier Output Filter Opt | Maxim Integrated
https://www.maximintegrated.com/en/design/technical-documents/app-notes/6/624.html
Abstract: This application note examines the effect of the output filter on audio Class D amplifier performance. Switch-mode amplifiers such as the MAX4295 and MAX4297 offer improved efficiency over their more traditional Class AB counterparts. By understanding the operation of these devices, the modulation noise spectrum and the loudspeaker loads they are required to …
Reducing the output filter of a Class-D amplifier
https://www.ti.com/lit/an/slyt198/slyt198.pdf
measured with the Audio Precision II analyzer. In each measurement, an RC filter with a cut-off frequency of 37 kHz was added between the output to ground to filter the common-mode signal into the Audio Precision. The bandwidth of the Audio Precision was set from 10 Hz to 22 kHz and an internal 20-kHz low-pass filter was also
When to Use a Pre-analyzer Filter - Audio Precision
https://www.ap.com/technical-library/when-to-use-a-pre-analyzer-filter/
The Audio Precision AUX-0025 is a two-channel low-pass pre-analyzer filter mounted in a 1U standard rack mount chassis. AUX-0025 can be used with any Audio Precision analyzer that has analog inputs, including System One, System Two, the 2700 Series and the ATS-2. The AUX-0025 has been carefully designed to reduce switch-mode (Class D and other ...
RC Filter Box For Class-D Output Power and THD+N …
https://www.ti.com/lit/an/sloa107/sloa107.pdf
RC Filter Box for Class-D Output Power and THD+N Measurement 5 NOTE: It is important that the signal generator, Class-D amplifier, filter box (GND), and oscilloscope or AP analyzer all be connected to the same ground in order to remove any common-mode voltage. Use the power supply ground for this purpose.
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