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What is the smallest capacitor in size, which has been engineered and how much is it's capacitance? I presume it must be something etched on chip.

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    $\begingroup$ There is parasitic capacitance between every pair of conductors. $\endgroup$ – ratchet freak Nov 3 '17 at 13:10
  • $\begingroup$ etched not itched... $\endgroup$ – Solar Mike Nov 3 '17 at 13:12
  • $\begingroup$ a) A pair of oppositely charged lithium ions shortly before they collide, and b) not much. $\endgroup$ – user6335 Nov 3 '17 at 13:57
  • $\begingroup$ @wossname not much it's really not an answer. $\endgroup$ – iuyhj Nov 3 '17 at 14:07
  • $\begingroup$ That's right, it's a comment. And for what it's worth this question is very loosely worded, so if you want good quality answers you need to be a lot more verbose in your questions' wording. $\endgroup$ – user6335 Nov 3 '17 at 14:22
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You can create caps with values down to 10fF or less (that's femto-farads) with size about 1 micron squared, but whether they are useful depends on the amount of stray capacitance in the rest of the chip wiring.

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