Measuring harmonic distortion and noise floor of an A/D convertor using spectral averaging

Author

Jenq, Y.C.

Author_Institution

Tektronix Inc., Beaverton, OR, USA

fYear

1988

fDate

7-9 Jun 1988

Firstpage

2569

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1988., IEEE International Symposium on

Conference_Location

Espoo

Type

conf

DOI

10.1109/ISCAS.1988.15466

Filename

15466