Patent ID: 7522660
Filing Date: 2009-04-21
Classification: G01R

Abstract:
1. A pulse pattern generating apparatus that generates a test signal of a predetermined pattern for measuring waveform quality of a digital signal by using plural digital-analog converters and outputs the test signal to a test subject, the apparatus comprising: a parameter setting unit for setting values of plural parameters that determine the shape of an eye pattern of the test signal; wherein the parameter setting unit displays a screen where a user can input values via a user interface in order to set and change a cross point position, relative to the rest of the eye pattern, and to set and change an amplitude of the eye pattern; a storage unit for storing output values to the digital-analog converters corresponding to the values of the parameters within setting ranges in which the values of the parameters are set; an arithmetic operation unit for calculating output values to the digital-analog converters from the values of the parameters from the parameter setting unit and the output values in the storage unit; a voltage value setting unit for setting, for the digital-analog converters, voltage values to be outputted from the digital-analog converters on the basis of the result of calculation by the arithmetic operation unit; and wherein the arithmetic operation unit performs interpolation from the output values in the storage unit and thus calculates output values corresponding to the values of the parameters set by the parameter setting unit.