Methods and apparatus for controlling write driver current

Details Methods and apparatus for controlling write driver current Methods and apparatus for controlling write driver current

2005-01-11

2010-02-09

Tzeng, Fred (Department: 2627)

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

Reexamination Certificate

active

07660064

ABSTRACT:
A hard disk drive write driver circuit is described that can change the output impedance of the write driver by use of a lookup table of control values. A control value is selected from the lookup table by using an address based on a dynamic system variable and a program controlled value. The dynamic system variable is converted to a digital representation. The digital representation and a portion of the program controlled value are used as an address to the lookup table to select a control value. The write driver is responsive to the selected control value to control overshoot current. A method to digitally program the output impedance of a preamp write driver based on realistic operating data is also discussed. An additional approach to controlling overshoot current in a write driver through digital control of overshoot duration is also described.

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