Patent ID: 6987472
Filing Date: 2006-01-17
Classification: H03M

Abstract:
1. A built-in-self-test apparatus for an analog-to-digital converter, comprising: a digital-to-analog converter, wherein the bit number of the digital-to-analog converter is less than or equal to that of an analog-to-digital converter to be tested, and the frequency of the analog-to-digital converter to be tested is a multiple of that of the digital-to-analog converter; a low-pass filter for smoothening output signals of the digital-to-analog converter and outputting the smoothened signals to the analog-to-digital converter to be tested; a histogram analyzer electrically connected to an output end of the analog-to-digital converter to be tested for calculating the number of appearances of each code; and a software engine electrically connected to an output end of the histogram analyzer for displaying the features of the analog-to-digital converter to be tested.