Patent ID: 6288529
Filing Date: 2001-09-11
Classification: G01R

Abstract:
A timing generation circuit for an electro-optical sampling oscilloscope apparatus that carries out measurement of a measured signal by using an optical pulse generated based on a timing signal generated from the timing generation circuit synchronous with a trigger signal, providing a timing generation circuit comprising:a fast ramp circuit that outputs a ramp waveform using said trigger signal as a trigger;a slow ramp circuit that has a D/A conversion circuit that outputs an output value increased stepwise and sequentially by D/A converting a count value of a counter into which said timing signal is input;a comparator circuit that compares the out put of said fast ramp circuit and the output of said slow ramp circuit and outputs the results of this comparison; anda gate circuit that limits the output of said comparator circuit by closing a gate during the D/A conversion time produced by the operation of said D/A conversion circuit after the rising time of said input timing signal and during the time in which the output of said fast ramp circuit falls from a maximum value to a minimum value after the rise time of said input trigger signal.