I want to build a comparator to compare voltages such that reference voltage is negative

i want to build a comparator to compare voltages where
reference voltage is negative,a square wave is to be generated at positive cycles of zero crossings of sine wave

I am having trouble in understanding your question (aside of my suspicion that this may be a school assignment ). Please check my previous explanation about comparators in your previous question:
http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=135&HOID=5065000000080000008C2B0000&UCATEGORY_0=_49_%24_6_&UCATEGORY_S=0
Also, check the following answer I provide for a current question about zero-crossing detection:
http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=135&HOID=5065000000080000008B2B0000&UCATEGORY_0=_49_%24_6_&UCATEGORY_S=0
Also, check the attached vi (LabVIEW 5). The vi generate a sine wave, detect if the is greater or lower than zero and create a square wave accordingly.
Best regards;
Vargas
www.vartortech.com
Attachments:
comparador.vi ‏46 KB

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