a method , an apparatus , and a computer program are provided to measure and / or correct duty cycles . duty cycles of various signals , specifically clocking signals , are important . however , measurement of very high frequency signals , off - chip , and in a laboratory environment can be very difficult and present numerous problems . to combat problems associated with making off - chip measurements and adjustments of signal duty cycles , comparisons are made between input signals and divided input signals that allow for easy measurement and adjustment of on - chip signals , including clocking signals .