Circuit and method for writing to a memory disk

摘要

A method and circuit are disclosed for controlling the write head of a magnetic disk storage device. The circuit includes a pull-up device coupled to a terminal of the write head, for selectively providing a current to the write head through the write head terminal. The circuit further includes parallel-connected current sink circuits, each of which is coupled to the write head terminal and selectively activated to draw current from the write head via the write head terminal. A first transistor is connected in series between the pull-up device and the write head terminal and biased to provide a voltage differential between the write head terminal and the pull-up device. A second transistor is connected in series between the write head terminal and the current sink circuits and biased to provide a voltage differential between the write head terminal and the current sink circuits.