Abstract: In accordance with the invention, a method, system and apparatus are presented that matches the output impedance of a driver to the impedance of a transmission line. A method for matching the impedance between a driver and a transmission line, wherein the transmission line is between the driver and a load can include transmitting a first pulse from the driver to the load through the transmission line, wherein a first reflection from the transmitted first pulse occurs after a first time, measuring a second reflection from the transmitted first pulse after a second time, and adjusting the calibration of the driver in response to the measured second reflection.

Abstract: In accordance with the invention, a method, system and apparatus are presented that matches the output impedance of a driver to the impedance of a transmission line. A method for matching the impedance between a driver and a transmission line, wherein the transmission line is between the driver and a load can include transmitting a first pulse from the driver to the load through the transmission line, wherein a first reflection from the transmitted first pulse occurs after a first time, measuring a second reflection from the transmitted first pulse after a second time, and adjusting the calibration of the driver in response to the measured second reflection.

Abstract: A system for calibrating a magneto-resistive (MR) head includes a biasing circuit and a calibration module. The biasing circuit generates a first current to bias a first head during a calibration mode and a calibrated current to bias the MR head during an operating mode. The calibration module calibrates the first current during the calibration mode by adjusting the first current using nonlinear steps to determine the calibrated current.

Abstract: In accordance with the invention, a method, system and apparatus are presented that matches the output impedance of a driver to the impedance of a transmission line. A method for matching the impedance between a driver and a transmission line, wherein the transmission line is between the driver and a load can include transmitting a first pulse from the driver to the load through the transmission line, wherein a first reflection from the transmitted first pulse occurs after a first time, measuring a second reflection from the transmitted first pulse after a second time, and adjusting the calibration of the driver in response to the measured second reflection.

Abstract: A linear regulator for outputting a regulated voltage with improved rejection of high frequency components in the power supply. The linear regulator includes an op-amp connected in a linear feedback loop to drive first and second current legs based on a voltage reference. An output driver includes a load capacitance across which the regulated voltage is output, and further includes a ratio-driven current mirror having a mirror ratio defined by relative sizes of active devices in the first and second current legs, as compared with relative sizes of active devices in the output driver. Because the output driver and its load capacitance are provided outside the linear feedback loop, large values for the load capacitance can be selected without destabilization of the feedback loop. Thus, the value of the load capacitance can be chosen at any value according to frequency rejection requirements.

Abstract: A circuit system and method are provided to modify a hard disk writer/driver pre-amplifier electronic circuit to synchronize current boosting control signals. The circuit system obtains a single boosting control signal from a single source. Component boosting control signals, a positive and a negative boosting control signal are indirectly generated via processing through two independent intermediate circuits. The two boosting control signals are pulse shaped signals via intermediate circuits which generate the corresponding first and second intermediate output signals in a manner that the two intermediate output signals are made compatible with one another and particularly synchronize to be later combined by some manner of combiner circuit without the generation of unwanted components in the output signal.

Abstract: A transimpedance amplifier (TIA) circuit comprises an input and an amplifying stage that includes N amplifiers, that generates a first signal and that is AC coupled to the input. A bias stage generates a second signal and that is DC coupled to the input. An output stage is driven by the first signal from the amplifying stage and the second signal from the bias stage.