UcD - correlation between phase lead network and propagation delay
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki 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 Cro maniac   diyAudio Member     Join Date: Feb 2004 Location: Zagreb, Croatia 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 lumanauw   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 Cro maniac   diyAudio Member     Join Date: Feb 2004 Location: Zagreb, Croatia 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 Off Forum Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Site     Site Announcements     Forum Problems Amplifiers     Solid State     Pass Labs     Tubes / Valves     Chip Amps     Class D     Power Supplies     Headphone Systems Source & Line     Analogue Source     Analog Line Level     Digital Source     Digital Line Level     PC Based Loudspeakers     Multi-Way     Full Range     Subwoofers     Planars & Exotics Live Sound     PA Systems     Instruments and Amps Design & Build     Parts     Equipment & Tools     Construction Tips     Software Tools General Interest     Car Audio     diyAudio.com Articles     Music     Everything Else Member Areas     Introductions     The Lounge     Clubs & Events     In Memoriam The Moving Image Commercial Sector     Swap Meet     Group Buys     The diyAudio Store     Vendor Forums         Vendor's Bazaar         Sonic Craft         Apex Jr         Audio Sector         Acoustic Fun         Chipamp         DIY HiFi Supply         Elekit         Elektor         Mains Cables R Us         Parts Connexion         Planet 10 hifi         Quanghao Audio Design         Siliconray Online Electronics Store         Tubelab     Manufacturers         AKSA         Audio Poutine         Musicaltech         Aussie Amplifiers         CSS         exaDevices         Feastrex         GedLee         Head 'n' HiFi - Walter         Heatsink USA         miniDSP         SITO Audio         Twin Audio         Twisted Pear         Wild Burro Audio

 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 09:35 AM.