Write precompensation circuit for compensating nonlinear magneti

Details Write precompensation circuit for compensating nonlinear magneti Write precompensation circuit for compensating nonlinear magneti

1994-04-18

1996-05-14

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Having specific delay in producing output waveform

327261, H03H 1126

Patent

active

055171460

ABSTRACT:
In accordance with the invention, a system which compensates nonlinear bit shift is provided for a high-rate constant density recording device. The invention's apparatus generates a programmable write precompensation delay that is an accurate percentage of the write current time period, allowing for variations of the write current time period with the track radius. The apparatus utilizes the output tinning signal from a Voltage Controlled Oscillator VCO to generate write precompensation delay that is an accurate percentage of the VCO output timing signal period, equal to the write current time period. Differential ramp voltage signal, also generated in the VCO, is compared to the late threshold voltage regulated by two internal resistors. Trailing edge of the delayed write signal, created at the comparator's output, is varied with the change in late threshold voltage. Frequency of the VCO's output timing signal is varied for different tracks. Since the frequency of the VCO is phase locked to the write current frequency, then the choice of the two internal resistors adjusts the precompensation delay period as a continuous percentage of the write current time period.

REFERENCES:
patent: 5047667 (1991-09-01), Howie

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