Infineon CoolGaN Class D amplifier EVAL_AUDAMP24 vs Purifi?

[hombre]

EVAL_AUDAMP24 module has adjustments for self oscillating frequency and external option:

Two potentiometers for adjusting self-oscillating frequency (one for each channel);

There are three switches on the reference design:
Switch S1 is an oscillator selector. This three-position switch is selectable for internal self-oscillator (middle position – “SELF”), or either internal (“INT”) or external (“EXT”) clock synchronization.

Switch S2 is an internal clock-sync phase difference selector. This feature allows the designer to modify the clock-sync phase separation in order to avoid synchronized switching noise interference. With S2 set to “off”, the sync-clock phase difference value is 180 degrees. With S2 set to “INT”, the clock-sync phase is set by potentiometer R100. With S2 set to “STG”, one channel’s clock is quadrature-lagging.

Switch S3 is a trip and reset push-button. Pushing this button has the same effect as a fault condition. The circuit will restart about 3 s after the shutdown button is released.

 

[Digital Mastering System]

Found it @ 395 euros = $467

I saw that the Gan Bosc Modules perform the following :

• SINAD @ 5W 1kHz: 105dB into 4Ω

As per Ranking it is very close to the Benchmark AHB2 ) For a very best price

$468 @ Digikey

 

[hombre]

Mouser also carries the EVAL_AUDAMP24 module for $468.

 

[Ro808]

This university project has aroused my interest and sympathy.

"A synchronously M odulated S witching E nhanced L oop Amplifier"
In the course of the project internship, the AMSEL Amplifier team deals with the development of a hi-fi class D audio amplifier with 2x100W output power. This is based on an asynchronous delta-sigma modulator and builds on previous projects at E&D. The aim is to compare different modulator and output stage configurations and to optimize the signal quality. GaN power semiconductors are used to significantly increase the switching frequency of the modulator compared to established technologies.
In the first phase of the project, an ASIC that takes over the analog-digital conversion is being developed. In the second phase of the project, a PCB is being developed that contains the output stage and the power filter, among other things.