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Trying to understand this circuit. Will this produce a representation similar to example in second image (if U_inf is the sine wave "original") ?

Assuming that, I expect U_DM to look like the "modulated" signal. How would the signal look like at point A and B ?

enter image description here

enter image description here

EDIT:

I'll add that the circuit (HPS modulation board) was tested with the following outputs. Increasing the U_s voltage level changed the signal to 2nd image.

enter image description here

enter image description here

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  • \$\begingroup\$ Get LTSpice (free) and simulate it for the best answer. \$\endgroup\$ – Andy aka Mar 3 '17 at 9:33
  • \$\begingroup\$ Yeah, that looks like Delta Modulation with a sample frequency that's too low or an integrator that's not fast enough. \$\endgroup\$ – Finbarr Mar 3 '17 at 10:05
  • \$\begingroup\$ Actually, no, you'd expect a triangle wave with straight lines at the integrator output not a staircase like that. \$\endgroup\$ – Finbarr Mar 3 '17 at 10:12
  • \$\begingroup\$ A would be purple and B would be light blue. (Whether B would be smooth or staircase as shown, depends on the details of that switch) \$\endgroup\$ – Brian Drummond Mar 3 '17 at 11:11
  • \$\begingroup\$ @Finbarr: "sample freq. too low"; May you elaborate the thought process on this. What details make this indication? \$\endgroup\$ – bretddog Mar 3 '17 at 11:39

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