I am wondering if anyone has come across this design in their work or use.
It is called an SATRI module and can be used in amp and dac's.
Here is a link to a translated page:
http://64.233.179.104/translate_c?hl=en&u=http://www.aud io-gd.com/audio/new_page_29.htm&prev=/search%3Fq%3Dbakoo n%2Bheadphone%2Bamplifer%26num%3D100%26hl%3Den%26lr%3D%26new window%3D1%26safe%3Dactive%26sa%3DG
Here is a second link for additional reference:
http://64.233.179.104/translate_c?hl=en&u=http://www.aud io-gd.com/audio/new_page_28.htm&prev=/search%3Fq%3Dbakoo n%2Bheadphone%2Bamplifer%26num%3D100%26hl%3Den%26lr%3D%26new window%3D1%26safe%3Dactive%26sa%3DG
Here is a link to a headphone amp using this technology:
http://64.233.179.104/translate_c?hl=en&u=http://www.aud io-gd.com/Pro/pre/c2/C_2.htm&prev=/search%3Fq%3Dbakoon%2 Bheadphone%2Bamplifer%26num%3D100%26hl%3Den%26lr%3D%26newwin dow%3D1%26safe%3Dactive%26sa%3DG