Method and Apparatus for Finding the Midpoint of a Rising or Falling Ramp in a Data Waveform and for Adjusting the Phase of a Clock with Respect to the Midpoint
Original Publication Date: 1989-Feb-01
Included in the Prior Art Database: 2005-Jan-29
A waveform of an electrical signal that represents binary data varies between two voltage levels and is commonly called a square wave. When a data waveform is viewed on a fast oscilloscope, its leading and trailing edges appear as rising and falling ramps. The half way point in the falling ramp is a timing reference point for establishing a clock signal that is used by a data waveform detector.