Patent ID: 8767900
Filing Date: 2014-07-01
Classification: H04L

Abstract:
1. A signal transition detection circuit comprising: a counter module to generate a digital step signal; a digital to analog converter (DAC) to convert the digital step signal into an analog input signal and to transmit the analog input signal to an under-test circuit such that the under-test circuit generates an output signal transiting from a first stable level to a second stable level, wherein a transition section is located between the first stable level and the second stable level; a comparator to receive the output signal and to compare the output signal with a default value to generate a normalized output signal; a digital sampling module to sample the normalized output signal to retrieve a plurality of impulses from the transition section and the second stable level such that when the number of the plurality of impulses is accumulated to be larger than a reference value, the counter module stops to generate the digital step signal; and a delay correction module to calculate a delay time according to the DAC, the comparator and the digital sampling module such that when the counter module stops to generate the digital step signal, a step of the digital step signal corresponding to a time that is a last generating time of the digital step signal minus the delay time is determined to be a corresponding step that is determined to be a transition point.