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Old 18th February 2012, 01:03 AM   #4821
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Thanks, will do.
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Old 21st February 2012, 02:07 PM   #4822
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I am building a disco 1,2V for DAC

- would you also recommend 2SK117 here (instead of 2sk170) as in bib??
- what mA should i aim at, for the idss at Q5 in error-circuit? (low as possible?)

peter

Last edited by pedefede; 21st February 2012 at 02:09 PM.
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Old 22nd February 2012, 01:14 AM   #4823
Salas is offline Salas  Greece
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They can be used also but be GR. Q5 lowest IDSS in your batch, yes.
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Old 25th February 2012, 03:04 PM   #4824
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sourcing components...

What would make a good resistor for psu (used for DAC)
1) smd ? (for short signalpath)
2) nonmagnetic ?
3) noninductive, noncapacitive ?
4) Else?
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Old 25th February 2012, 04:07 PM   #4825
Salas is offline Salas  Greece
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Low ppm.
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Old 25th February 2012, 04:26 PM   #4826
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Low TCR
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Old 25th February 2012, 08:01 PM   #4827
RCruz is online now RCruz  Switzerland
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What is TCR ?
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Old 25th February 2012, 09:45 PM   #4828
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Quote:
Originally Posted by Salas View Post
Low ppm.
low ppm prevents drift of V-out, with rising temperature. But does it benifit performance (noise, Zo etc) in any other way?
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Old 25th February 2012, 11:37 PM   #4829
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What is TCR ?
Temperature Coefficient of Resistance (TCR) is expressed as the change in resistance in ppm ( .0001%) with each degree of change in temperature Celsius (Co). This change is not linear with the TCR the lowest at +25oC and increasing as the temperature increases ( or decreases). It can be either a bell shaped curve or an S shaped curve. It is treated as being linear unless very accurate measurements are needed, then a temperature correction chart is used. Normally a resistor with a TCR of 100 ppm will change 0.1% over a 10 degree change and 1% over a 100 degree change. The expression of ppm , one part in a million is similar to percent or 1 part in 100 (or percentile)
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Old 26th February 2012, 10:08 AM   #4830
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Quote:
Originally Posted by RCruz View Post
Temperature Coefficient of Resistance (TCR) is expressed as the change in resistance in ppm ( .0001%) with each degree of change in temperature Celsius (Co). This change is not linear with the TCR the lowest at +25oC and increasing as the temperature increases ( or decreases). It can be either a bell shaped curve or an S shaped curve. It is treated as being linear unless very accurate measurements are needed, then a temperature correction chart is used. Normally a resistor with a TCR of 100 ppm will change 0.1% over a 10 degree change and 1% over a 100 degree change. The expression of ppm , one part in a million is similar to percent or 1 part in 100 (or percentile)
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