Patent ID: 7332916
Filing Date: 2008-02-19
Classification: G01R

Abstract:
1. An on-chip signal waveform measurement apparatus mounted on an IC chip, said on-chip signal waveform measurement apparatus measuring signal waveforms at a plurality of detection points on the IC chip, said on-chip signal waveform measurement apparatus comprising: a reference voltage generator for successively generating and outputting a plurality of reference voltages different from each other based on a predetermined timing signal; a plurality of signal probing front-end circuits mounted so as to correspond to the detection points, respectively, each of said signal probing front-end circuits buffer-amplifying a voltage at each of the detection points, comparing the buffer-amplified voltage with each of the reference voltages, digitizing a comparison result into a binary digital output signal, and outputting the binary digital output signal; a multiplexer for time-division-multiplexing the binary digital output signals from said signal probing front-end circuits, and outputting a multiplexed digital output signal; and a data processing unit for calculating and outputting a judgment output probability for a detected voltage at each of the detection points detected by each of said signal probing front-end circuits, by counting a number of times of a predetermined binary value of the multiplexed binary digital output signal outputted from said multiplexer.