Patent ID: 7746591
Filing Date: 2010-06-29
Classification: G11B

Abstract:
1. A hard disk drive write system comprising: a drive signal generator configured to receive data to be written to a hard disk drive platter and to generate drive signals based thereon, wherein the drive signals include a boost signal; a drive circuit electrically coupled to the drive signal generator and to a transmission line and configured to receive the drive signals and to generate currents for output to the transmission line based thereon, wherein the currents include a boost current; a variable bias circuit electrically coupled to the drive signal generator and an impedance matching circuit, wherein the variable bias circuit is configured to detect the boost signal generated by the drive signal generator and to vary a bias signal provided to the impedance matching circuit based on the detection of the boost signal; and the impedance matching circuit electrically coupled to the variable bias circuit, the drive circuit, and the transmission line to match impedances between the drive circuit and the transmission line in response to the bias signal provided by the variable bias circuit.