I found this on IEEE's page: https://sscs.ieee.org/education/2017-2018-circuit-analysis-design-contest

Is there a name for this circuit or even does this circuit exist? If so, why and what is the circuit structure?

  • 3
    \$\begingroup\$ It wouldn't be much of a design contest if it already had a name and you could look it up on the web. \$\endgroup\$
    – Chu
    Dec 18, 2017 at 9:22
  • \$\begingroup\$ Something which adds is an add-er, subtract is a subtract-er/-or. Multiply : multiply-er (Which in English becomes -ier). So following that logic, this must be a Sinus-er or a Sinus-or. \$\endgroup\$
    – Oldfart
    Dec 18, 2017 at 11:09
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    \$\begingroup\$ @Chu: Not necessarily. A contest could be about extreme specs for a common function. See Google's contest for small and efficient inverter as example. You could have a contest for something as simple as a buck converter to make 5 V at 1 A from 24 V, with the distinguishing characteristic being the highest efficiency wins. A contest does not mean obscure requirements by itself. \$\endgroup\$ Dec 18, 2017 at 12:52
  • \$\begingroup\$ could call ir a "sinner" \$\endgroup\$ Dec 18, 2017 at 23:46
  • \$\begingroup\$ Note that you made this requirement up yourself. Nowhere does the contest mention that it must be a sin(x) function. On the contrary, it is specifically mention: The characteristic need not be a sinusoidal function. \$\endgroup\$
    – pipe
    Dec 24, 2017 at 11:28

2 Answers 2


It is called a Folding Amplifier. You just need to tack on an opamp to get the 1V swing. See here.


This circuit doesn't have a standard or common name. These requirements are highly unusual. This has therefore been done so rarely, if at all, that no common name for this circuit has evolved.

  • \$\begingroup\$ Just curious, how would you approach such a problem statement? From zero to first peak, I can assume an op-amp but what then? \$\endgroup\$ Dec 18, 2017 at 14:10
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    \$\begingroup\$ @Whis: That's for the contestants to figure out. No, I'm not going to give any ideas. \$\endgroup\$ Dec 18, 2017 at 14:40
  • \$\begingroup\$ @ whiskeyjack, well no. the competition requires operation from a 1V supply, if any supply was allowed then yeah comparators that enable adding or subtracting from the input at each corner voltage. \$\endgroup\$ Dec 18, 2017 at 23:53
  • \$\begingroup\$ @OlinLathrop Since the contest is over can give a hint? I've built a circuit that does this function but it was huge and noisy. I don't think the solution to this problem is what I built. \$\endgroup\$
    – Alper91
    Jul 29, 2018 at 13:03

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