TT amp, 200W/8ohm, 701W/2ohm
 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

 Solid State Talk all about solid state amplification.

 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
 8th August 2012, 01:47 PM #31 dadod   diyAudio Member     Join Date: Apr 2006 Location: Zagreb Those are correct data: ULGF = 1MHz RL = 4ohm, Pout=330W THD1k = 7ppb THD20k = 1.33ppm (1.08ppm, RL = 8ohm) THD50k = 15.72ppm THD100k =0.009624% THD200k =0.061653% RL = 4k, THD20k = 0.77ppm PM = 92 degree GM = 15dB
 8th August 2012, 01:48 PM #32 Dave Zan   diyAudio Member   Join Date: Nov 2010 Hi Dado Nice work. I am a bit surprised by the loop gain plot. After heated debate in earlier threads I think that finally there was consensus that TMC is a second order system and that the similarity to (1st order) Miller comp in the outer loop is deceptive. The loop gain plot that sets the stability limit should show second order behaviour and I don't see that. Is there some explanation? Best wishes David
diyAudio Member

Join Date: Apr 2006
Location: Zagreb
Quote:
 Originally Posted by Dave Zan Hi Dado Nice work. I am a bit surprised by the loop gain plot. After heated debate in earlier threads I think that finally there was consensus that TMC is a second order system and that the similarity to (1st order) Miller comp in the outer loop is deceptive. The loop gain plot that sets the stability limit should show second order behaviour and I don't see that. Is there some explanation? Best wishes David
It is similar to Miller comp if TMC resistor was connected outside(directly to output) the probe. Here is screen shot with the resistor inside the probe.
Attached Images

diyAudio Member

Join Date: Apr 2006
Location: Zagreb
Here is low power version.

ULGF = 1MHz
RL = 8ohm, Pout=95W
THD1k = 1.09ppm
THD20k = 1.74ppm
THD50k = 16.15ppm
THD100k =0.014506%
THD200k =0.114467%
RL = 4k, THD20k = 0.77ppm
PM = 90 degree
GM = 15dB

It is quite simple, specialy if capacitance multipliers for OPS were removed and powered with +-45 V instead.
Attached Files

 8th August 2012, 02:19 PM #35 liching1952   Banned   Join Date: Aug 2012 what is a C multiplier?
 8th August 2012, 02:35 PM #36 Dave Zan   diyAudio Member   Join Date: Nov 2010 Thank you - that plot is much more informative. The outer loop plot always looks like Miller compensation so it is deceptive without an explanation. Best wishes David
Dave Zan
diyAudio Member

Join Date: Nov 2010
Quote:
 Originally Posted by liching1952 what is a C multiplier?
Capacitance multiplier - Transistor connected to a capacitor to "multiply" the effective capacitance.

Best wishes
David

liching1952
Banned

Join Date: Aug 2012
Quote:
 Originally Posted by Dave Zan Capacitance multiplier - Transistor connected to a capacitor to "multiply" the effective capacitance. Best wishes David
It what kind of application is that used? You get the the nonlinearity and limitations of the transistor for free as bonus.

 8th August 2012, 02:54 PM #39 liching1952   Banned   Join Date: Aug 2012 and why not just use a bigger C instead of a C multiplier?
diyAudio Member

Join Date: Apr 2006
Location: Zagreb
Quote:
 Originally Posted by liching1952 and why not just use a bigger C instead of a C multiplier?
You can search this forum, it was written quite a lot about capacitance multiplier here.

 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         Holton Precision Audio         CSS         Dx Classic Amplifiers         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 ddog Solid State 15 11th July 2013 11:04 AM sssuneth Class D 1 27th January 2012 09:23 PM goldyrathore Solid State 0 11th June 2010 04:21 PM Reidy- Tubes / Valves 8 10th January 2010 11:25 PM dok33 Car Audio 1 15th May 2004 09:00 PM

 New To Site? Need Help?

All times are GMT. The time now is 09:09 PM.