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Jeremy Robert Kuehlwein
Jeremy Robert Kuehlwein, Woodbury, MN US
| Patent application number | Description | Published |
|---|---|---|
| 20080239543 | METHODS AND APPARATUS FOR GENERATING A HARD DRIVE WRITE SIGNAL - Methods and apparatus for generating a hard drive write signal are here in disclosed. A disclosed method comprises generating a hard drive write signal on an output of a switch based on an edge of the first control signal and reducing the hard drive write signal based on an edge of a second control signal via a second switch. | 10-02-2008 |
| 20080239558 | METHODS AND APPARATUS FOR DURATION CONTROL OF HARD DRIVE WRITE SIGNALS - Methods and apparatus for controlling the duration of a pulse in a hard drive write system are disclosed. A disclosed method comprises generating a current pulse, reducing the current of the pulse and conveying a portion of the current pulse to a hard drive write system. In addition, a method is disclosed whereby a portion of the current pulse is truncated. | 10-02-2008 |
| 20080239563 | METHODS AND APPARATUS FOR TEMPERATURE COMPENSATION FOR HARD DISK DRIVE WRITE OVERSHOOT CURRENT - Methods and apparatus for temperature compensation for hard disk drive writer overshoot current are disclosed. A disclosed system comprises creating a first delay based on the temperature of the hard disk drive, creating a second delay based on the temperature of the hard disk drive, and creating a pulse based on the first and second delay. | 10-02-2008 |
| 20090140797 | Rapidly Activated Current Mirror System - One embodiment of the invention includes a current mirror system. The system comprises a master circuit configured to conduct a first current in response to an activation state of an activation signal. The system also comprises a slave circuit configured to generate at least one second additional current in response to the activation state of the activation signal. Each of the at least one additional current can be proportional to the first current. The system further comprises a current path circuit that is configured as a substantial copy of the master circuit, the current path circuit being configured to conduct the first current in response to a deactivation state of the activation signal. | 06-04-2009 |
| 20090244757 | Methods and Apparatus for Low Power Hard Disk Drive Servo Writers - Methods and apparatus to for low power hard disk drive servo writers. A disclosed servo writer comprises a distribution circuit to receive one or more pulses from a pulse generator, the distribution circuit having a biasing circuit have one of a first write mode or a second write mode based on an operating condition signal; and a first signal generator to form a first write signal and a second signal generator to form a second write signal, the first and second signal generators being actuated by the distribution circuit, wherein the distribution circuit actuates one of the first and second signal generators in the first write mode and the distribution circuit actuates the first and second signal generators in the second write mode. | 10-01-2009 |
| 20120019947 | TECHNIQUE FOR PROGRAMMABLE RISE TIME IN HARD DISK DRIVE WRITER - A write channel for a hard disk drive has a write current with a programmably adjustable rise time, and includes first and second analog write data signal paths having respective resistive nodes. First and second programmable capacitors are connected to the resistive nodes, whereby changes in capacitance of the first and second capacitors changes the rise time of the write current. A programmer selectively programs the first and second programmable capacitors. The rise time programmed is selected to provide a decreased bit error rate of an on-track write process and reduced adjacent-track interference. | 01-26-2012 |
Jeremy Robert Kuehlwein, Woodburry, MN US
| Patent application number | Description | Published |
|---|---|---|
| 20080265950 | LOW-POWER IMPEDANCE-MATCHED DRIVER - One embodiment of the invention includes a driver circuit. The driver circuit comprises a high-side switch that is activated in response to a positive driver input signal to provide a positive output signal at a driver output. The driver circuit also comprises a low-side switch that is activated in response to a negative driver input signal to provide a negative output signal at the driver output. The positive and negative driver input and output signals can be relative to respective cross-over magnitudes. The driver circuit further comprises at least one impedance-matching device configured to activate the low-side switch in response to a positive signal reflection at the driver output and to activate the high-side switch in response to a negative signal reflection at the driver output. | 10-30-2008 |
| 20080265951 | DRIVER WITH PROGRAMMABLE POWER COMMENSURATE WITH DATA-RATE - One embodiment of the invention includes a driver circuit. The driver circuit comprises an output transistor that is biased to provide an output signal in response to an input signal. The driver circuit also comprises at least one programmable variable resistor configured to provide a bias magnitude of the output transistor that sets a power of the driver circuit to be commensurate with a data-rate of the input signal. | 10-30-2008 |
| 20080266696 | WRITE DATA SWITCHING FOR MAGNETIC DISK DRIVES - One embodiment of the invention includes a system for writing data onto a magnetic disk. An output driver provides a first write current through a first output transistor in a first state and provides a second write current through a second output transistor in a second state. The first and second write currents can be provided to a disk write head to store opposing binary values, respectively. A bias current generator switches a first bias current between an intermediate voltage node in the second state and the first control node in the first state, and switches a second bias current between the intermediate voltage node in the first state and the second control node in the second state. The first and second bias currents can be provided to set a bias voltage at the first and second control nodes to bias the first and second output transistors, respectively. | 10-30-2008 |
Jeremy Robert Kuehlwein, Wodbury, MN US
| Patent application number | Description | Published |
|---|---|---|
| 20120105992 | METHOD AND CIRCUITRY FOR PROGRAMMABLY CONTROLLING DEGAUSS WRITE CURRENT DECAY IN HARD DISK DRIVES - A control circuit to provide a control current to control an amplitude of a write current in a magnetic media drive. The control circuit has an output circuit for providing the control current with an amplitude dependent on a bias voltage. A bias current path provides the bias voltage to the output circuit, and a current diverting circuit is connected to divert current from the bias current path. A programmable ramp voltage generator operates in response to a degauss enable signal, and a voltage-to-current converter receives the programmable ramp voltage to control the current diverting circuit to divert current from the bias current path at a rate determined by the programmable ramp voltage. The bias voltage and the write current decay according to the programmable ramp voltage. The write current decay can be made linear and independent of a beginning write current amplitude. | 05-03-2012 |