System for recording data on a storage medium.

摘要

A write precompensation circuit employs a frequency synthesizer (Fig. 1) for providing a variable timing signal linked to a variable transfer rate, for example in a track zone recording system of a disk drive. The synthesizer also provides an operating frequency current-sense signal (OFCS-FS) that is used to generate bit shift of data bits being recorded. A ramp voltage on a ramp capacitor (38) and a logic signal from a bit shift decision circuit (40) are determinative of the magnitude and direction of bit shift, early or late. A VCO (20) of the frequency synthesizer, including its capacitor (26) are formed on the same IC chip as the ramp capacitor (38) thereby minimizing mismatch due to tolerances inherent in production and operation of electrical components. <IMAGE>