MAGNETIC RECORDING DISK DRIVE WITH WRITE DRIVER TO WRITE HEAD TRANSMISSION LINE WITH MULTIPLE SEGMENTS HAVING DIFFERENT NUMBERS OF CONDUCTIVE TRACES

摘要

A multiple-segment transmission line in a hard disk drive enables a wider optimization range of the slope, duration and amplitude of the transmission line overshoot (TLO) wave shape. There is a first segment with two traces for connection to the write driver circuitry, an end segment with two traces for connection to the write head and at least two intermediate segments. The number of traces in a segment is different from the number of traces in the segments to which the segment is immediately connected. There is an even number of traces in each segment and the traces in each segment are interleaved. The number of segments and the number of traces in each segment can be selected to achieve the desired impedance levels for the different segments to achieve the desired wave shape for the TLO. All of the traces on the transmission line are preferably coplanar.

主权项

1. In a magnetic recording disk drive having write driver circuitry and an inductive write head, a transmission line between the write driver circuitry and the write head comprising:
multiple connected transmission line segments, each segment comprising a number of electrically conductive +W traces for positive write signals and an equal number of electrically conductive traces −W traces for negative write signals interleaved with the +W traces, the transmission line including a first segment with two traces for connection to the write driver circuitry, an end segment with two traces for connection to the write head, and at least two intermediate segments, wherein the number of traces in each intermediate segment is greater than two and different from the number of traces in the segments to which it is immediately connected.