A 27MHz Mixed Analog/digital Magnetic Recording Channel DSP Using Partial Response Signalling With Maximum Likelihood Detection
Timothy J. Schmerbeck, R.A. Richetta, L.D. Smith · 1991
Most magnetic rigid-disk-drive recording channels to date have used continuous-time, analog "peak detect" approaches for signal detection. This IC uses sampled data detection with partial response class-IV (PR-IV) signaling and maximum likelihood (ML) sequence detection (PRML). Error rate performance on the drive is superior to that obtainable from previous peak-detect channels. PR-IV and ML have been used previously in communication channels as well as slow-speed floppy and tape drives; the theory is well known.