Deflection Reference Adjustment for Variable Track Pitch Media
AssigneeDoug Carson & Associates, Inc.
InventorDouglas M. Carson
Life of this patent
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Abstract
Apparatus and method for generating an analog waveform, such as a deflection signal used to deflect a write beam during the writing of data to a rotatable medium having a variable track pitch (TP). In accordance with various embodiments, a first digital to analog converter (DAC) is configured to output a deflection signal having an analog voltage level corresponding to a magnitude of a first multi-bit digital input value applied to the first DAC. A second DAC is configured to supply a rail voltage to the first DAC having an analog voltage level corresponding to a magnitude of a second multi-bit digital input value applied to the second DAC. The deflection signal is used to deflect a write beam supplied by a write beam generator.
Claims20
An apparatus comprising:
- a first digital to analog converter (DAC) configured to output a deflection signal having an analog voltage level corresponding to a magnitude of a first multi-bit digital input value applied to the first DAC;
- a second DAC configured to supply an analog reference voltage to the first DAC having an analog voltage level corresponding to a magnitude of a second multi-bit digital input value applied to the second DAC;
- and
- a write beam generator which generates a write beam, wherein the write beam is deflected by the deflection signal.
An apparatus comprising a writer system used to write data to a storage medium in the form of a plurality of concentric tracks, the writer system comprising a motor which controllably rotates the storage medium, a write beam generator which generates a write beam to impinge the storage medium to write data thereto, and a deflection control system adapted to repetitively deflect the write beam over each revolution of the storage medium, the deflection control system comprising a first digital to analog converter (DAC) configured to output an analog deflection signal having an analog voltage level corresponding to a magnitude of a first multi-bit digital input value applied to the first DAC, and a second DAC configured to supply an analog rail voltage to the first DAC having an analog voltage level corresponding to a magnitude of a second multi-bit digital input value applied to the second DAC.
A method comprising:
- providing a first digital to analog converter (DAC) coupled to a second DAC, the second DAC adapted to supply a rail voltage to the first DAC;
- generating a deflection signal as an output analog voltage from the first DAC responsive to a first multi-bit digital input value applied to the first DAC and a second multi-bit digital input value applied to the second DAC;
- and
- using the deflection signal to deflect a write beam from a write beam generator.
Dependencies are inferred from the claim text.