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

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  • \$\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
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    \$\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
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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

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