I though that I mastered TIM

thanh · 5th August 2005, 04:34 AM

degeneration resistor can't improve anything

thanh · 5th August 2005, 04:38 AM

input stage with current mirror is said to get TIM very much

thanh · 5th August 2005, 04:46 AM

I cant know !
4k degeneration resistor distor more 1 ohm degeneration

destroyer X · 5th August 2005, 09:07 AM

And now, having your analisis, i conclude that i do not need to bother myself to understand how it works...as it is seeming not to work.

regards,

Carlos

destroyer X · 5th August 2005, 09:11 AM

As there are people that are installing those resistors even in the CCS.

Grumpf!

regards,

Carlos

destroyer X · 5th August 2005, 09:17 AM

Here is already openned image.

turning things easier.

regards,

Carlos

MikeB · 5th August 2005, 12:04 PM

Hi thanh,
for creating complex signals / adding signals, simply put the signalsources
in series...
This sums perfectly the signals !

Mike

Ultima Thule · 5th August 2005, 12:39 PM

Quote:

Originally posted by thanh
I cant know !
4k degeneration resistor distor more 1 ohm degeneration

Thanh,

have you used any other values between 1 ohm and 4 kohm??
And you have read Leech paper about diffpair degeneration?
Maybe best to sort out what is distorting, remove current mirror and look at the diffpair alone first to decide what gives what in your analyses.

Michael

thanh · 6th August 2005, 04:22 AM

Ok ! I will re-check
I found that degeneration resistors is not good .Amp will sound dirtier .My current amp dont use them but it still sound well

jaycee · 6th August 2005, 05:23 AM

220 ohms works well as emitter degeneration. Currentmirrors gave me problems especially in a complementary diffamp configuration. A cascode is better. A useful side effect of using a cascode is you can use the zener regulated midpoint as your current source with only a resistor (which is lower noise, apparently)

5th August 2005, 04:46 AM	#3
thanh diyAudio Member Join Date: Jan 2004 Location: ho chi minh city	I cant know ! 4k degeneration resistor distor more 1 ohm degeneration __________________ Justice for Victims of Agent Orange http://www.petitiononline.com/AOVN/Thank all of you!

6th August 2005, 04:22 AM	#9
thanh diyAudio Member Join Date: Jan 2004 Location: ho chi minh city	Ok ! I will re-check I found that degeneration resistors is not good .Amp will sound dirtier .My current amp dont use them but it still sound well __________________ Justice for Victims of Agent Orange http://www.petitiononline.com/AOVN/Thank all of you!

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5th August 2005, 12:04 PM	#7
MikeB diyAudio Member Join Date: Apr 2004 Location: Gütersloh	Hi thanh, for creating complex signals / adding signals, simply put the signalsources in series... This sums perfectly the signals ! Mike

6th August 2005, 05:23 AM	#10
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	220 ohms works well as emitter degeneration. Currentmirrors gave me problems especially in a complementary diffamp configuration. A cascode is better. A useful side effect of using a cascode is you can use the zener regulated midpoint as your current source with only a resistor (which is lower noise, apparently)

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