Patent ID: 6580380
Filing Date: 2003-06-17
Classification: H03M

Abstract:
An apparatus for testing linearity of an analog to digital converter, comprising:a controller that outputs a resolution control signal that is used to convert an analog signal into a digital signal, that provides control to test linearity of the digital signal, and that provides control to display a test signal; a signal generator that generates an analog triangular wave signal; an analog to digital converter that converts the analog triangular wave signal generated by said signal generator into the digital signal and that outputs the digital signal; a memory that stores the digital signal output from said analog to digital converter as digitized code value, under control of said controller; a digital filter that digitally filters the digitized code value stored in said memory to provide a filtered digital code value, under control of said controller; a histogram producer that generates a histogram responsive to the filtered digital code value; and a display that displays the histogram generated by said histogram producer as the test signal, under control of said controller.