High speed pre-driver with voltage reference for thin film head write driver

摘要

A preamplifier device ( 26 ) for a thin film transducer disk drive system having operation speeds up to and greater than 2 Gb/s. The device ( 26 ) includes a low power/high speed driver ( 203 ) having a cascaded Class AB buffer. In at least one embodiment the device ( 26 ) includes separated drive devices in the driver ( 203 ) and H-bridge circuit ( 205 ) realized in multiple smaller devices biased separately to reduce transistor self-heating effects and a further embodiment includes a reference ( 201 ) having a base cancellation scheme and a Class AB current source for improving accuracy and stability is such high speed devices.