LME 49810 CFP output stage

sasmit · 2nd October 2009, 01:06 PM

I am trying to design an amp based on the complementary feedback pair concept, although this a slight deviation from the original CFP concept because of the extra transistors in the output stage. The schematic shows 3055 and 2955 in the output stage but the reason they are there is eagle only had these with package outline matching my requirements. I intend to use some sustained beta devices.
There are quite a few 49810 designs out there but all of them are Emitter Follower types...I might have goofed up here....any feedback will be highly appreciated..

peranders · 2nd October 2009, 01:23 PM

Just wondering, why do you want this topology? A potential problem may be that this power stage has gain involved => problems with the phase characteristics.

sasmit · 2nd October 2009, 01:42 PM

ya..that is one of the charateristics of a cfp stage to have some ammount of gain..but is superior to an emiiter follower design in terms of Large signal linearity and distortion figures. This design is very simmilar to one found on rod elliot P3 amp. I did some reading and it seems thermal stability is better than an EF type besides "beta droop" is lower than an EF type.

panson_hk · 6th October 2009, 07:45 AM

All my 498xx are EF outputs. Looking forward to see your results.

2nd October 2009, 01:23 PM	#2
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	Just wondering, why do you want this topology? A potential problem may be that this power stage has gain involved => problems with the phase characteristics. __________________ /Per-Anders (my first name) or P-A as my friends call me

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2nd October 2009, 01:42 PM	#3
sasmit diyAudio Member Join Date: May 2006	ya..that is one of the charateristics of a cfp stage to have some ammount of gain..but is superior to an emiiter follower design in terms of Large signal linearity and distortion figures. This design is very simmilar to one found on rod elliot P3 amp. I did some reading and it seems thermal stability is better than an EF type besides "beta droop" is lower than an EF type.

6th October 2009, 07:45 AM	#4
panson_hk :) diyAudio Member Join Date: Aug 2005 Blog Entries: 10	All my 498xx are EF outputs. Looking forward to see your results.

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