current source

maitre Aliboron · 2006-04-20T16:39:25+00:00

Any idea for a voltage controlled current source(linear of course) to be implemented in a CMOSprocess? The difficult part is to get rid of processvariations (the most dispersed component seems tobe the poly resistor)Variants from standard textbook bias sources(Vittoz, PTAT, Wilson...) seem not to work properly;I get changes of more than +/- 40% from centered value.Temperature compensation is not important, nor PSRR.I'm looking for solutions which compensateresistors variations, for example making use ofa differential pair. I could make use of a bandgap,if necessary, though I prefer to avoid it.Do you know any solution?thanks.maitre Aliboron

Apr 20, 2006 22 Replies

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Paul E. Schoen 20 years ago

Could you record it in action and provide a link to a .WAV file? Might be interesting!

I only recently learned about this phenomenon for piano tuning. The way I understand it, the sound is more pleasant when the beat frequency of octaves is audible, rather than causing a subsonic variation in amplitude. Is this a reasonable explanation?

Paul E. Schoen

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Don Lancaster 20 years ago

Properly tuned pianos are never tuned to unison; A slight beat frequency is allowed to remain (perhaps 0.5 or 0.33 Hertz) to "fatten" the sounds and produce chorous effects.

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