Patent ID: 6456148
Filing Date: 2002-09-24
Classification: G11B

Abstract:
A driver circuit for the write head of a disk storage device, comprising:a first pull-up device, the pull-up device being selectively coupled to a high reference voltage level and activated to provide a current to a first terminal of the write head, the pull-up device comprising a first pull-up transistor; a first transistor connected in series between the first pull-up device and the first terminal of the write head, the first transistor having a control terminal that is biased at a first voltage to provide a non-zero, finite voltage differential between the first terminal of the write head and the first pull-up device; a pull-down transistor coupled between the first terminal of the write head and a low reference voltage level, the pull down transistor being selectively activated to sink current from the write head; a second transistor connected in series between the first terminal of the write head and the current sink, the second transistor having a control terminal that is biased at a second voltage different from the first voltage to provide a non-zero, finite voltage differential between the first terminal of the write head and the pull-down transistor; and a circuit coupled to a second terminal of the write head for sinking current from the write head approximately when the first pull-up device is activated, and sourcing a current to the write head approximately when the pull-down transistor is activated.