Disk drive employing vector addition of primary phase write clock signals for generating secondary phase write clock signal

Abstract

A disk drive includes a disk having a recording surface and a write element for writing a sequence of symbols in a continuous-time signal on the recording surface. The disk drive includes a frequency generator for generating a plurality of primary phase write clock signals having a channel frequency fch. Each of the primary phase write clock signals has a selected primary phase shift from another one of the primary phase write clock signals. The disk drive includes a programmable phase synthesizer for generating a secondary phase write clock signal having the channel frequency fch and a selected secondary phase shift from one of the primary phase write clock signals. The programmable phase synthesizer includes programmable means for selecting two of the primary phase write clock signals and element for performing vector addition of the selected primary phase write clock signals to generate the secondary phase write clock signal. The secondary phase write clock signal is used for providing at least one of the symbols in the sequence of symbols to the write element.

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