US 7,068,454 B2 · Hard disk storage system including a first transistor type and a second transistor type where a first voltage level pulls one of a first pair of transistors and a second voltage level pulls one of a second pair of transistors at substantially the same time

Abstract

A write driver produces balanced voltages across head by using the input write data drive transistors of a slower transistor type (typically PNP) on one half of an H-bridge configuration, while transistors of a faster transistor type (typically NPN) in the other half of the H-bridge configuration are driven indirectly by transistors of the slower type, with a trans-resistance in series with transistors of the faster type. Accordingly, the voltage nodes on either side of the write head are pulled to Vcc and Vee symmetrically. A trans-resistance block (40) uses current sources to pull current from capacitive nodes for faster switching.

Claims16

Dependent claims

A hard disk storage system, comprising:

a magnetic disk;
a head for writing data to the disk;
a preamplifier for orienting a current through the head in a desired direction responsive to a data signal, comprising:
a first pair of transistors of a first type driven by the data signal coupled to across said head;
a second pair of transistors of a second type coupled across said head and driven by a transistor of the first type, such said first and second pairs of transistors provide a current path through the head in a direction responsive to the data signal;
where the first transistor type is slower than the second transistor type, so that one terminal of the head is pulled to a first voltage level through one of the first pair of transistors and another terminal of the head is pulled to a second voltage level through one of the second pair of transistors at substantially the same time.

3 more elements

Dependencies are inferred from the claim text.

Hard disk storage system including a first transistor type and a second transistor type where a first voltage level pulls one of a first pair of transistors and a second voltage level pulls one of a second pair of transistors at substantially the same time

Life of this patent

Hard disk storage system including a first transistor type and a second transistor type where a first voltage level pulls one of a first pair of transistors and a second voltage level pulls one of a second pair of transistors at substantially the same time

Life of this patent

Abstract

Claims16