Virtual voltage power supply

Details Virtual voltage power supply Virtual voltage power supply

1997-05-23

2000-01-04

Cunningham, Terry D.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Utilizing three or more electrode solid-state device

327589, H03K 1756

Patent

active

060114231

ABSTRACT:
A voltage boosting circuit for an "H-driver," providing for each "pull-up" switch in the H-driver a switching shunt that charges a capacitor from a supply voltage when the "pull-up" switch is open and couples the capacitor directly to the write head when the "pull-up" switch is closed. The side of the capacitor which is not directly coupled to the write head is coupled to the data signal (or its inverse, in the case of the capacitor for the otherwise identical circuit serving the parallel half of the "H-driver") through a buffer which sets the voltage at the signal level (or its inverse), thereby dumping the charge to the write head and elevating the voltage of the write head significantly above the supply voltage. The identical circuit serving the parallel half of the "H-driver" similarly boosts the negative going transition voltage.

REFERENCES:
patent: 4535203 (1985-08-01), Jenkins et al.
patent: 4926354 (1990-05-01), Pattantyus
patent: 5481447 (1996-01-01), Caris et al.
patent: 5493543 (1996-02-01), Kamens
patent: 5521871 (1996-05-01), Choi
patent: 5672992 (1997-09-01), Nadd
patent: 5811850 (1998-09-01), Smayling et al.
patent: 5860941 (1999-01-01), Saringer et al.

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