A time-correlation method of calculating nonlinearities utilizing pseudorandom sequences

Author

Che, Xiaodong ; Ziperovich, Pablo A.

Author_Institution

Quantum Corp., Milpitas, CA, USA

Volume

30

Issue

6

fYear

1994

fDate

11/1/1994 12:00:00 AM

Firstpage

4239

Lastpage

4241

Abstract

A new time-correlation method of measuring nonlinearities using pseudorandom sequences is presented. The method relies on the properties of pseudorandom sequences to display nonlinearities as echoes of the main response. The size and position of these echoes correspond to the amount and the type of nonlinear effect present in the system, respectively. The accuracy of the time-correlation method was verified in simulation using Lorentzian waveforms, and with real systems. The measurement accuracy is compared to other more complex methods. The time-correlation method can be implemented with analog or digital circuits, enabling the real-time measurement of nonlinear distortions

Keywords

binary sequences; correlation methods; magnetic recording; magnetic recording noise; Lorentzian waveforms; magnetic recording; measurement accuracy; nonlinear distortion; nonlinearity calculation; pseudorandom sequences; real-time measurement; time-correlation method; Circuit simulation; Density measurement; Digital circuits; Displays; Distortion measurement; Fourier transforms; Nonlinear distortion; Random sequences; Shape; Writing;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.334047

Filename

334047