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Input impedance measurement using ADC FFT data

Posted: 10 Feb 2011     Print Version  Bookmark and Share

Keywords:Texas Instruments  analog-to-digital converters  FFT 

Texas Instruments has introduced a family of analog-to-digital converters (ADCs) suited to meet the demand for high-speed and high-IF sampling systems. To achieve the highest overall system performance, an analog front-end circuit with an antialiasing filter must drive the ADC with the highest possible dynamic range and lowest distortions. One important parameter of the front-end circuit design is knowing the overall input impedance of the ADC. One method of accurately measuring the ADC input impedance is to use ADC FFT readings to calculate the input impedance that corresponds to the source resistance changes. This application report shows the steps to quickly measure the ADC input impedance and printed circuit board parasitics without making additional changes to the test setup and variables such as probe impedance.

View the PDF document for more information.





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