positive voltage out from rectifier with diode

[danjel]

I was looking at a simple comparator opamp circuit that had a diode on it's output to allow only positive voltage values out. This made sense but what I did not understand is why there is a resistor to gnd right after this. It was a peak detector then there should be a capacitor there too afaik.

Can anyone explain this?

(the output marked as Positive Swing)
**broken link removed**

 

[danjel]

Found out the answer! It is a pulldown resistor in case you interface to CMOS logic input.

 

[BrownOut]

Also to provide a discharge path to any capacitance at the output node.

 

[danjel]

Also to provide a discharge path to any capacitance at the output node.

yes you are totally correct. I found out about that too (capacitance at CMOS inputs)