Can anyone explain to me the function of those two diodes?

  • \$\begingroup\$ Deduce what happens when you remove the diodes (short them) and apply a \$V_{in}\$ for which applies: \$ V_{in} > V_{REF(LOW) } \$ and \$ V_{in} > V_{REF(HIGH) } \$ \$\endgroup\$ – Huisman Apr 30 at 8:20
  • 1
    \$\begingroup\$ Consider 3 Cases: \$V_{in} < V{ref(lo)}\$, \$V_{in} > V{ref(high)}\$ and \$ V_{ref(lo)} < V_{in} < V_{ref(high} \$. What does each op-amp output? What would happen without the diodes? \$\endgroup\$ – Warren Hill Apr 30 at 10:50

It's a simple form of logic gate called a diode OR. See: https://en.wikipedia.org/wiki/Diode_logic http://www.play-hookey.com/digital_electronics/dl_gates.html


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.