Continuous-time filter tuning with a delay-locked-loop in mass s

Details Continuous-time filter tuning with a delay-locked-loop in mass s Continuous-time filter tuning with a delay-locked-loop in mass s

1992-09-16

1994-09-06

Dolinar, Andrew M.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328167, 360 7814, H03K 500, G11B 5596

Patent

active

053451198

ABSTRACT:
A delay-locked-loop (DLL) controls the cutoff frequency of a filter in an exemplary mass storage servo control channel. The cutoff frequency is adjusted in response to a clock pulse which updates the DLL. Between pulses, the DLL holds its value, reducing power consumption. The DLL has a fixed delay (precision) and a variable delay cell producing two delayed outputs, one output a predetermined amount after the other output. The DLL locks the delayed pulses from the variable delay cell to straddle a delayed pulse from the precision delay. The filter has selectable resistors and capacitors for adjusting the frequency thereof. Substantially identical selectable resistors and fixed capacitors are in the variable delay cell. The DLL selects which resistors in the variable delay cell (and corresponding resistors in the filter) results in the straddled delayed pulses. The capacitors in the filter are selected for the approximate desired cutoff frequency of the filter.

REFERENCES:
patent: 4509019 (1985-04-01), Banu et al.
patent: 4894734 (1990-01-01), Fischler et al.
patent: 4945311 (1990-07-01), Smith
patent: 5182478 (1993-01-01), Nomura
"LC.sup.2 MOS Complete Embedded Servo Front Ends for HDD", Analog I/O Ports, REV.O. Analog Devices Preliminary Technical Data pp. 8-43 through 8-62 (date unknown).
"Disk Interface Design Guide and Users Manual", National Semiconductor Application Note 413, AN-413, J. Cecil, R. Gopalan, W. Llewellyn, S. Masood, P. Tucci, L. Wakeman pp. 9-3 through 9-46 (date unknown).

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