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IC current source solves myriad problems, attenuates headaches

4/27/2009 11:00 AM EDT
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DickH
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re: IC current source solves myriad problems, attenuates headaches
DickH   5/6/2009 7:58:36 PM
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one small inaccuracy here is that, if that schematic really represents the circuit function, the output current Isource as labelled should be Isource = (1 + Rset/Rout).10uA - it's the current in Rout that's 10uA * Rset/Rout

bcarso
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re: IC current source solves myriad problems, attenuates headaches
bcarso   5/6/2009 5:39:36 PM
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An interesting part, although there are a some performance details apparently not covered in the datasheet, of relevance in among other cases when the part might be used as an active load. What for example is the minimum capacitance of a given configuration and how does it vary with voltage? What is the minimum noise for a given configuration when the reference resistor is bypassed, so as to make most of the reference current noise and reference resistor thermal noise go away---that is, what is the contribution from the internal error amp's noise? BTW, although the award-winning voltage regulator on which this is based is undoubtedly a fine part, it has been pointed out by Jan Didden in a recent audioXpress that the basic concept is quite old, and was used in a long-obsolete Motorola part. Hard to do anything new these days!

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