Linearizing average transfer characteristics of ideal ADC´s via analog and digital dither

Author

Wagdy, Mahmoud Fawzy ; Goff, Michael

Author_Institution

Dept. of Electr. Eng., California State Univ., Long Beach, CA, USA

Volume

43

Issue

2

fYear

1994

fDate

4/1/1994 12:00:00 AM

Firstpage

146

Lastpage

150

Abstract

This paper is a continuation to the previous work by M.F. Wagdy (see ibid., vol. 38, p. 850-855, Aug. 1989). It further investigates the effect of various dither forms, i.e., with different probability density functions (PDF´s), on the average observed transfer characteristics of ideal A/D converters (ADC´s). First the deviation of the ADC characteristics from the ideal straight line is evaluated for analog dither forms using the concept of nonlinearity spectra developed in the above work. Second, two cases of digital (discrete) dither are investigated, one with rectangular envelope and the other with triangular one. Effects of dither peak-to-peak values and number of PDF impulses are investigated. The paper provides a quantitative basis for replacing analog dither with the easier to implement digital dither

Keywords

analogue-digital conversion; error analysis; interference suppression; linearisation techniques; probability; signal processing; transfer functions; Wagdy; analog dither; average observed transfer characteristics; average transfer characteristics linearisation; digital dither; dither peak-to-peak values; ideal ADC; ideal straight line; nonlinearity spectra; probability density functions; rectangular envelope; triangular envelope; Decorrelation; Fourier transforms; Harmonic distortion; Noise reduction; Probability density function; Quantization; Signal resolution; Speech enhancement; Teeth; Voltage;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.293411

Filename

293411