Title :
Measuring harmonic distortion and noise floor of an A/D convertor using spectral averaging
Author_Institution :
Tektronix Inc., Beaverton, OR, USA
Abstract :
The author proposes the use of spectral averaging techniques to measure the harmonic distortions and the noise floor of an analog-to-digital (A/D) digitizing subsystem. The noise floor of an ideal 8-bit A/D convertor is derived in closed form. It is shown that this noise floor is a function of the A/D resolution, the record length, and the equivalent noise bandwidth of the window function used in the DFT (discrete Fourier transform) computation. Both experimental and simulation results are presented and it is shown that they are in good agreement with the theoretical results
Keywords :
analogue-digital conversion; electric distortion measurement; electric noise measurement; spectral analysis; A/D convertor; A/D resolution; ADC model; DFT computation; discrete Fourier transform; distortion measurement; equivalent noise bandwidth; harmonic distortion; noise floor; noise measurement; record length; spectral averaging; window function; Converters; Distortion measurement; Dynamic range; Floors; Harmonic distortion; Noise measurement; Sampling methods; Signal analysis; Signal to noise ratio; Spectral analysis;
Conference_Titel :
Circuits and Systems, 1988., IEEE International Symposium on
Conference_Location :
Espoo
DOI :
10.1109/ISCAS.1988.15466
