An algorithm for a real time measurement of nonlinear transition shift by a time domain correlation analysis

Author

Guo Mian

Author_Institution

Conner Peripherals, San Jose, CA, USA

Volume

31

Issue

1

fYear

1995

Firstpage

816

Lastpage

819

Abstract

An algorithm has been developed for a real time measurement of the nonlinear transition shift in high areal density magnetic recording, by a time domain correlation analysis. By measuring SNR and a correlation coefficient of the time domain readback voltages, r[/spl nu/(t), /spl nu/(t+/spl epsiv//2+(M/sub 1/-1/2)T)], written by a pseudorandom sequence, we can determine the nonlinear transition shift in real time. This new algorithm not only simplifies data processing of the readback waveform, but also includes noise effects on the nonlinear transition shift measurement. This algorithm has been implemented by LeCroy Corporation into their 7200-A high-speed digital oscilloscope. The LeCroy oscilloscope measures the nonlinear transition shift in less than 100 ms utilizing this algorithm.<>

Keywords

correlation methods; magnetic recording; magnetic transitions; magnetic variables measurement; time-domain analysis; correlation coefficient; high areal density magnetic recording; high-speed digital oscilloscope; nonlinear transition shift; real time measurement; signal-to-noise-ratio; time domain correlation analysis; time domain readback voltages; Algorithm design and analysis; Area measurement; Data processing; Density measurement; Magnetic analysis; Magnetic recording; Oscilloscopes; Random sequences; Time domain analysis; Voltage;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.364591

Filename

364591