High speed hard disk drive with symmetric writer

摘要

A disk drive data storage system. The system comprises a magnetic disk and a head for writing data to the disk. The system also comprises circuitry for providing a first voltage (HWX) to a first node (N₁) and a second voltage (HWY) to a second node (N₂). The head is coupled to the first and second nodes such that a data state is written to the disk in response to the first and second voltage. The first and second voltage circuitry comprises a first transistor ( 42 _1P2) of a first type and coupled to the first node, a first transistor ( 42 _2N2) of a second type and coupled to the second node, a second transistor ( 44 _1P2) of the first type and coupled to the second node, and a second transistor ( 44 _2N2) of the second type and coupled to the second node. The system also comprises circuitry for coupling a first biasing signal (VNDY) to the first transistor of the first type at a first time, and comprising a signal path for the first biasing signal that passes through a base-emitter junction of transistors of both the first and second type. The system also comprises circuitry for coupling a second biasing signal (VPDY) to the first transistor of the second type at the first time, and comprising a signal path for the second biasing signal that passes through a base-emitter junction of transistors of both the first and second type. The system also comprises circuitry for coupling a third biasing signal (VNDX) to the second transistor of the first type at a second time, and comprising a signal path for the third biasing signal that passes through a base-emitter junction of transistors of both the first and second type. Lastly, the system also comprises circuitry for coupling a fourth biasing signal (VPDX) to the second transistor of the second type at the second time, and comprising a signal path for the fourth biasing signal that passes through a base-emitter junction of transistors of both the first and second type.