UcD - correlation between phase lead network and propagation delay - diyAudio
 UcD - correlation between phase lead network and propagation delay
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read Search

 Class D Switching Power Amplifiers and Power D/A conversion

 Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
 11th April 2008, 07:38 PM #1 diyAudio Member     Join Date: Feb 2004 Location: Zagreb, Croatia Blog Entries: 2 UcD - correlation between phase lead network and propagation delay I am newbie to classD, and some things are unclear to me. In Bruno Putzeys AES paper it is said that oscillation in ucd amplifier occurs at the point where the propagation delay and phase lead cancel out because output filter already does 180 degrees of phase shift (well, almost 180). The oscillation frequency is known factor because we choose it when designing the amplifier. Propagation delay is also known for the components we choose. So the only thing one needs to calculate is phase network values. Now, do we need the phase lead network to introduce phase shift of 180-t_prop to have full 180 degrees of phase shift that would add to 180 of output filter to initiate oscillation, or we have to take into account that the comparator in basic ucd circuit is inverting, and in that case the phase shift of lead network would have to be identical to that of the lead network, not 180-t_prop ? This confuses me
 12th April 2008, 05:46 AM #2 diyAudio Moderator Emeritus     Join Date: Oct 2002 Location: Bandung If you visit www.hypex.nl , in "Technology", there's a graph in section 1.2 about phase' of various components and oscillating frequency.
 12th April 2008, 06:35 AM #3 diyAudio Member     Join Date: Feb 2004 Location: Zagreb, Croatia Blog Entries: 2 Thx for the reply. I saw that graph, but didn't look at it with understanding before. I see now that propagation delay is way up in phase and exactly t_prop + t_output_filter (which is <

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are Off Pingbacks are Off Refbacks are Off Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post mitchyz250f Parts 6 18th May 2008 09:07 PM apolon34 Digital Source 14 20th April 2008 01:14 PM Jamesblond Subwoofers 24 10th August 2006 09:36 PM Tenson Parts 5 10th March 2006 09:32 PM jaygeorge1979 Multi-Way 4 13th January 2006 01:17 PM

 New To Site? Need Help?

All times are GMT. The time now is 05:29 AM.