Performance evaluation of an adaptive RAM-DFE read channel

Philip S. Bednarz, Nicholas P. Sands, Cory S. Modlin, Susan C. Lin, Inkyu Lee, John M. Cioffi

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The bit error rate (BER) performance of a 54 Mbps RAM-Decision feedback equalizer (RAM-DFE) read channel for magnetic hard-disk drives is evaluated. A controlled test environment allows comparison of measured BER to the performance predicted by a model of the equalizer and channel. Implementational effects are found to degrade performance 0.6 dB in relation to theory. Measurements also show a 0.2 dB loss due to error propagation at 10-8 BER with the probability of a 30 bit burst, given a single decision error, to be less than 10-5. A simple Markov model of the error propagation process corroborates the findings. Finally, the RAM-DFE read channel is compared to a partial response maximum likelihood (PRML) detector of similar complexity on a spin-stand running with a thin-film head and media. The RAM-DFE exhibits a measured 25 fold decrease in BER over the PRML system on a wide range of densities.

Original languageEnglish
Pages (from-to)1121-1127
Number of pages7
JournalIEEE Transactions on Magnetics
Volume31
Issue number2
Publication statusPublished - 1995 Mar 1
Externally publishedYes

Fingerprint

Decision feedback equalizers
Random access storage
bit error rate
Bit error rate
evaluation
Maximum likelihood
propagation
Hard disk storage
Equalizers
bursts
Detectors
Thin films
detectors
thin films

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

Cite this

Bednarz, P. S., Sands, N. P., Modlin, C. S., Lin, S. C., Lee, I., & Cioffi, J. M. (1995). Performance evaluation of an adaptive RAM-DFE read channel. IEEE Transactions on Magnetics, 31(2), 1121-1127.

Performance evaluation of an adaptive RAM-DFE read channel. / Bednarz, Philip S.; Sands, Nicholas P.; Modlin, Cory S.; Lin, Susan C.; Lee, Inkyu; Cioffi, John M.

In: IEEE Transactions on Magnetics, Vol. 31, No. 2, 01.03.1995, p. 1121-1127.

Research output: Contribution to journalArticle

Bednarz, PS, Sands, NP, Modlin, CS, Lin, SC, Lee, I & Cioffi, JM 1995, 'Performance evaluation of an adaptive RAM-DFE read channel', IEEE Transactions on Magnetics, vol. 31, no. 2, pp. 1121-1127.
Bednarz PS, Sands NP, Modlin CS, Lin SC, Lee I, Cioffi JM. Performance evaluation of an adaptive RAM-DFE read channel. IEEE Transactions on Magnetics. 1995 Mar 1;31(2):1121-1127.
Bednarz, Philip S. ; Sands, Nicholas P. ; Modlin, Cory S. ; Lin, Susan C. ; Lee, Inkyu ; Cioffi, John M. / Performance evaluation of an adaptive RAM-DFE read channel. In: IEEE Transactions on Magnetics. 1995 ; Vol. 31, No. 2. pp. 1121-1127.
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