Preamplifier for a writer of a hard disk drive with fast rise time

A method for boosting a current waveform of a hard disk drive writer, comprising:

• generating a switching signal based on a transition edge of a data signal;
• applying the switching signal to turn on an output transistor;
• generating a boosting pulse based on the transition edge of the data signal;
• applying the boosting pulse to an alternating current coupled signal path;
• applying a buffered voltage signal to a base terminal of the output transistor;
• and
• conducting an output signal of the alternating current coupled signal path through a current mirror circuit to the base terminal of the output transistor.

A preamplifier for a writer of a hard disk drive with fast rise time, comprising:

• logic to generate a switching signal based on a data signal and generate a boosting pulse based on the data signal;
• an output transistor of an H-bridge circuit, the output transistor to turn on based on the switching signal and output a current to the writer of the hard disk drive;
• a voltage buffer circuit having an output coupled to a base terminal of the output transistor;
• an alternating current coupled signal path to receive the boosting pulse and output a signal based on the boosting pulse;
• and
• a current mirror circuit coupled to the voltage buffer circuit and the alternating current coupled signal path, the current mirror circuit to conduct the signal to the base terminal of the output transistor.