A circuit and method are disclosed for relatively rapidly causing the current
flowing
through a write head to transition between steady states without generating an
appreciable amount of capacitively-coupled noise. Embodiments of the present invention
generally provide drive voltage signals to the write head that have no common mode
voltage levels during transitions between steady state current levels in the write
head. In other words, the drive voltage signals applied to the write head are substantially
entirely differential during write head current transitions. In an exemplary embodiment
of the present invention, a driver circuit includes switching circuitry connected
between the terminals of the write head and reference voltage supplies, such as
positive and negative voltage supplies. The driver circuit further includes timing
circuitry that generates control signals for controlling the switching circuitry.