Class BD is known for 3 state, high-low-0. the well known patent is #6,097,249 from Rockford
I found this : http://www.google.com/patents?id=7nWHAAAAEBAJ&dq=robert+zeff+class+BD
It seems an improvement over Rockford's patent. Is it Robert Zeff of Zapco?
How can Fredos make classBD only with 2 output mosfets? http://www.diyaudio.com/forums/showthread.php?postid=904729#post904729
I found this : http://www.google.com/patents?id=7nWHAAAAEBAJ&dq=robert+zeff+class+BD
It seems an improvement over Rockford's patent. Is it Robert Zeff of Zapco?
How can Fredos make classBD only with 2 output mosfets? http://www.diyaudio.com/forums/showthread.php?postid=904729#post904729
Bit different...Triangle are in phase and audio out of phase in these patents...I use in phase audio with out of phase triangle, with some cmos logic to achieve bd modulation...
In this way the audio output signal might suffer cross-over like distortion
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