Title :
Relationship Between Equalized SNR and Jitter—Theory and Application to PMR and HAMR
Author :
Valcu, Bogdan F. ; Gee, Harold ; Alex, Michael ; Champion, Eric
Author_Institution :
Western Digital, San Jose, CA, USA
Abstract :
A simple analytical relationship between equalized signal-to-noise ratio (SNR) and jitter is derived theoretically. Equalization is applied to the spectra of pseudorandom sequence signals, by whitening the frequency content of the noise. Jitter is evaluated in the frequency domain with square waveform signals. We verify experimentally that, for a wide range of linear densities, we can predict well-equalized SNR (and thus overall system performance) by using the measured jitter value.
Keywords :
equalisers; frequency-domain analysis; jitter; magnetic recording; random sequences; waveform analysis; HAMR; PMR; equalized SNR; equalized signal-to-noise ratio; frequency domain analysis; heat-assisted magnetic recording; jitter value measurement; perpendicular magnetic recording; pseudorandom sequence signal spectra; square waveform signal; Frequency measurement; Heat-assisted magnetic recording; Jitter; Media; Signal to noise ratio; Vectors; Equalization; jitter; noise whitening; pseudorandom sequence (PRS);
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2014.2319215
