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Old 5th August 2005, 04:34 AM   #1
thanh is offline thanh  Viet Nam
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Default I though that I mastered TIM

degeneration resistor can't improve anything
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Old 5th August 2005, 04:38 AM   #2
thanh is offline thanh  Viet Nam
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input stage with current mirror is said to get TIM very much
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Old 5th August 2005, 04:46 AM   #3
thanh is offline thanh  Viet Nam
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I cant know !
4k degeneration resistor distor more 1 ohm degeneration
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Old 5th August 2005, 09:07 AM   #4
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Default This is interesting to me Thanh, i never could understand how this works.

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
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Old 5th August 2005, 09:11 AM   #5
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Default Now i turn more nervous with Blameless amplifier.

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

Grumpf!

regards,

Carlos
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Old 5th August 2005, 09:17 AM   #6
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Default The graphic.

Here is already openned image.

turning things easier.

regards,

Carlos
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Old 5th August 2005, 12:04 PM   #7
MikeB is offline MikeB  Germany
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Hi thanh,
for creating complex signals / adding signals, simply put the signalsources
in series...
This sums perfectly the signals !

Mike
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Old 5th August 2005, 12:39 PM   #8
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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
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Old 6th August 2005, 04:22 AM   #9
thanh is offline thanh  Viet Nam
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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
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Old 6th August 2005, 05:23 AM   #10
jaycee is offline jaycee  United Kingdom
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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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