Patent ID: 7133234

Claim:
A preamplifier, comprising: a common mode generator; an H-bridge circuit; a current mirror coupled to the common mode generator and to the H-bridge circuit; an overshoot system coupled to the current mirror and the H-bridge circuit; a first write head connection node adapted to produce a first write signal, wherein the first write head connection node is coupled to the H-bridge circuit; and a second write head connection node adapted to produce a second write signal, wherein the second write head connection node is coupled to the H-bridge circuit; wherein the common mode generator is adapted to provide current; wherein the current is adapted to establish a voltage across the first write head connection node and the second write head connection node; wherein the voltage is adapted to be pulled toward a first polarity based on the first write signal and toward a second polarity based on the second write signal; and wherein the voltage pulled toward the first polarity and the voltage pulled toward the second polarity are substantially centered about a common mode voltage, a first current source coupled to the common mode generator, wherein the first current source supplies current to the current mirror when the first current source is at a maximum level.