Title :
An integrating servo demodulator for hard disk drives
Author :
Shariatdoust, Reza ; Nagaraj, K. ; Khoury, John ; Daubert, Steve ; Fasen, Don
Author_Institution :
AT&T Bell Lab., USA
Abstract :
The design of a high-performance integrating servo demodulator circuit for hard disk-drive systems is described. This design implements a filter, demodulation of the normal and quadrature position error signals, off-track detector, and servo timing. The operating frequency range is 1 MHz to 6 MHz with pulse width (PW50) variation from 60 ns to 180 ns. The servo has a dedicated AGC (automatic gain control) loop with a 15-dB range. The linearity of the position error signal output is better than 3%. The circuits are implemented in 0.9-μm CMOS technology
Keywords :
hard discs; 1 to 6 MHz; 60 to 180 ns; CMOS technology; dedicated AGC loop; hard disk drives; high-performance; integrating servo demodulator; off-track detector; pulse width variation; servo filter; servo timing; CMOS technology; Circuits; Demodulation; Detectors; Filters; Hard disks; Servomechanisms; Signal design; Signal detection; Timing;
Conference_Titel :
Custom Integrated Circuits Conference, 1993., Proceedings of the IEEE 1993
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-0826-3
DOI :
10.1109/CICC.1993.590691
