I've played with those EPC GaN FETs before. I was doing research on them at my university for use as drivers for streak cameras. Our main attraction was the radiation hardness of GaN devices. Unfortunately the quality control for EPC GaN FETs were pretty bad. Only about half of our devices worked and we assembled our boards with microscopes and nice hot air soldering stations.
Regarding modeling of these devices, one of my tasks was to come up with a better model for them. Eventually I gave up and decided that it was better to just empirically design circuits with them on the bench rather than trying to make a very accurate spice model.
Regarding modeling of these devices, one of my tasks was to come up with a better model for them. Eventually I gave up and decided that it was better to just empirically design circuits with them on the bench rather than trying to make a very accurate spice model.
The guy who designed the JK Acoustics module is actually an audiophile colleague of mine who sometimes gives his hobby designs to JK Acoustics in exchange for some piece of audiophile equipment. The main reason why he designed his own digital filter is that he didn't like the undithered roundings of intermediate results in the standard off-the-shelf FIR filters. His filter only rounds the final result and does so with proper triangular PDF dither. I've heard his set-up one afternoon and I was impressed (under totally uncontrolled and unscientific conditions, of course).
POWER-DAC vs. Class-D Amp (T-Amp) with analog input - which audible benefit?
There are only few commercial models of this kind of digital amp - examples are Wadia 151
http://www.hifishock.org/galleries/...ard/wadia-dac/151-power-dac-mini-1b-wadia.jpg
or this German device
....::: HIFIAkademie.de :::....
Are there diy projects and schematics available from this kind of digital amp ?
Are there audible enhancements to observe compare to usual class-D amp with analog input (when low-jitter S/P-DIF signal is available) ?
Thank you for advices.
There are only few commercial models of this kind of digital amp - examples are Wadia 151
http://www.hifishock.org/galleries/...ard/wadia-dac/151-power-dac-mini-1b-wadia.jpg
or this German device
....::: HIFIAkademie.de :::....
Are there diy projects and schematics available from this kind of digital amp ?
Are there audible enhancements to observe compare to usual class-D amp with analog input (when low-jitter S/P-DIF signal is available) ?
Thank you for advices.
Texas Instruments have some evaluation modules.
You could also take a look here
https://sites.google.com/site/koonaudioprojects/tas5706-full-digital
To be as "digital" as possible, the amplfier should be open loop. If it's closed loop, there will be an analog feedback.
My experience is that digital input class d amplifiers can be very transparent
This article is also quite good (i think)
http://www.eetasia.com/STATIC/PDF/200909/EEOL_2009SEP04_ACC_TA_01.pdf?SOURCES=DOWNLOAD
You could also take a look here
https://sites.google.com/site/koonaudioprojects/tas5706-full-digital
To be as "digital" as possible, the amplfier should be open loop. If it's closed loop, there will be an analog feedback.
My experience is that digital input class d amplifiers can be very transparent
This article is also quite good (i think)
http://www.eetasia.com/STATIC/PDF/200909/EEOL_2009SEP04_ACC_TA_01.pdf?SOURCES=DOWNLOAD
Nuforce DDA-100 and DDA-120....NAD D3020....NAD C390DD...El cheapo FX Audio D802.....D.Sound D310..... There are quite many of them on the market.
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