An eye diagram is an oscillocope display in which the ...................... is synchronized to the ..................... .
MH SET - 2019, SET Exam - 2019,
Answer: C
The blanks are filled by time base, bit rate: the oscilloscope's time base is synchronized to the bit rate.
An eye diagram is made by feeding a received digital signal to the vertical input of an oscilloscope and triggering the horizontal sweep from the symbol (bit) clock. Every bit period is then drawn on top of the previous ones, and the overlaid traces form the open "eye". If the time base were not locked to the bit rate, the traces would drift across the screen and no eye would form.
The reversed option D would mean the bit rate is locked to the scope sweep, which gets the roles the wrong way round; the bit rate belongs to the signal and the scope follows it. Options A and B use an "intensity base", which is not a term for any oscilloscope timing control (the intensity control sets brightness).
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