SESSION SA19

SALON 8

DISK-DRIVE SIGNAL PROCESSING

Chair: L. Thon, IBM Almaden Research Center, San Jose, CA
Associate Chair: T. Tuttle, Broadcom Corp., Irvine, CA

19.1 - A 200Mb/s CMOS EPRML Channel with Integrated Servo Demodulator for Magnetic Hard Disks - 8:30 AM

J. Fields1, K. Fitzpatrick2, K. Fisher2 1Bell Laboratories, Allentown, PA 2Quantum Corp., Milpitas, CA

EPR4 detection is by adding a reduced-complexity EPR4 post-processor to a PR4 channel. A 9b ADC is integrated with an analog 20MHz servo demodulator. Nonlinearity cancellation and thermal asperity detection are provided for MR heads. This 16.9mm2 0.5um CMOS IC dissipates 1.6W at 200Mb/s user rate and 5V.

19.2 - A 1,7 Code EEPR4 Read Channel IC with an Analog-Noise-Whitened Detector - 9:00 AM

R. Yamasaki, M. Palmer, C. Tammel, R. Kuki1, H. Lin, R. Sandusky2, G. Asakawa2, J. Devoy2, S. Burnham2, D. Gruetter, B. McClellan Silicon Systems Inc., Tustin, CA/1Tokyo, Japan/2Colorado Springs, CO

Noise whitening halves the complexity of a 1,7 code analog look-ahead detector for performance comparable to that of a full EEPR4 Viterbi detector. The 16.4mm2 0.8um BiCMOS chip is a fully integrated read/write channel IC operating in excess of 300MSample/s (200Mb/s user rate) at 1.3W and 5V supply.

19.3 - A 200MSample/s Trellis-Coded PRML Read/Write Channel with Digital Servo - 9:30 AM

R. Alini, G. Betti, F. Brianti, M. Demicheli, P. Gadducci, A. Dati, S. Marchese, G. Bollati, V. Pisati, E. Marconetti, M. Zuffada, R. Castello1, F. Heydari2, G. Maguire4, P. Gillen4, D. Reddy4, M. Marrow4, N. O'hEarcain4, S. McDonagh4, F. O'Brien4, J. O'Brien4, L. Fredrickson5, L. Volz5, D. Stone5 SGS-Thomson Microelectronics, Milan, Italy, 3San Jose, CA 2Universit degli Studi di Pavia, Pavia, Italy 4Silicon Systems Design Ltd., Dublin, Ireland 5Seagate Technology, Simi Valley, CA

Digital circuits implement Matched Spectral Null (MSN) trellis coding, standard PR4 Viterbi detection, servo demodulation and pulse qualification, and four-level write precompensation for medium nonlinearity. This 54mm2 0.7um BiCMOS device dissipates 2W with MSN or 1.5W with PR4 code at 4.5V and 200MSample/s channel rate.

BREAK 10:00 AM

19.4 - An EPRML Digital Read/Write Channel IC - 10:15 AM

J-G. Chern, C. Conroy, R. Contreras, P. Lai, L. Moser, T. Pan, J. Rae, S-M. Shih, X. Si, H. Thapar, J. Tierney, A. Yeung, M. Sugawara1, Y. Tamura2 DataPath Systems, Santa Clara, CA 1NEC Corp., Tokyo, Japan, 2Santa Clara, CA

EPR4 detection is with an 8-state Viterbi detector. Equalization is perfomed entirely by analog continuous-time filter with on-chip calibration. This 27.5mm2 0.56um, 10GHz BiCMOS IC dissipates 1.3W at 165Mb/s from a 5V supply. Measured BER versus SNR performance is within 1dB of ideal.

19.5 - A 160MHz Analog Equalizer for Magnetic Disk Read Channels - 10:45 AM

S. Kiriaki, T. Viswanathan, G. Feygin, B. Staszewski, R. Pierson, T. B. Krenik, M. De Wit, K. Nagaraj Texas Instruments, Dallas, TX

A 160MHz five-tap analog equalizer uses a direct-form FIR architecture, BiCMOS sample-and-hold, and time-shared sign-sign adaptation hardware. The 1.35mm2 circuit dissipates 200mW from 5V, and uses 0.8um technology with 0.72um npns, triple-layer metal and double-poly capacitors.

19.6 - An 80Mb/s Adaptive DFE Detector in 1um CMOS - 11:15 AM

J. Brown, P. Hurst, B. Rothenberg, S. Lewis University of California, Davis, CA

An analog RAM-DFE detector for read channels uses adaptive forward and feedback equalizers to cancel precursor and postcursor ISI. The continuous-time feedforward equalizer has one adaptive zero derived from two outputs of a 7th-order linear-phase low-pass filter. The 11.2mm2 1um CMOS detector dissipates 630mW at 80Mb/s and 5V.

19.7 - A 20MHz BiCMOS Peak-Detect Pulse Qualifier and Area- Detect Servo Demodulator for Disk Drive Servo Loop - 11:45 AM

M-T. Huang, F. Spagna, J. Blink Silicon Systems Inc., San Jose, CA

A pulse qualifier has programmable threshold bit-fault detection from 0% to +/-60% of 1Vppd. The servo demodulator uses automatic trim for internal capacitor variation compensation. The 2.15mm2 0.8um BiCMOS circuit dissipates 170mW at 5V.

CONCLUSION 12:15 PM

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