Hi-speed preamplifier write driver for hard drive with...

Details Hi-speed preamplifier write driver for hard drive with... Hi-speed preamplifier write driver for hard drive with...

2007-03-13

2007-03-13

Wellington, Andrea (Department: 2627)

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

C360S046000

Reexamination Certificate

active

11375513

ABSTRACT:
A write driver (38) produces balanced voltages across head (32) by using the input write data (WDX and WDY) 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.

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