Hard disk storage system including a first transistor type...

Details Hard disk storage system including a first transistor type... Hard disk storage system including a first transistor type...

2006-06-27

2006-06-27

Young, Wayne (Department: 2651)

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

C360S046000

Reexamination Certificate

active

07068454

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.

REFERENCES:
patent: 6121800 (2000-09-01), Leighton et al.
patent: 6271978 (2001-08-01), Block et al.
patent: 6400190 (2002-06-01), Lacombe
patent: 2001/0022700 (2001-09-01), Lacombe
patent: 2003/0184901 (2003-10-01), Takahashi
patent: 2005/0094305 (2005-05-01), Kuehlwein et al.

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