ΔΣ変調ADCを用いたモータ駆動用ディジタル信号処理方式の検討(ディジタル・情報家電,放送用,ゲーム機用システムLSI,回路技術(一般,超高速・低電力・高機能を目指した新アーキテクチャ))

概要

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This paper propose a new control method for the VCM (Voice Coil Motor) of the HDD (Hard Disc Drive) with a Delta Sigma Analog-to-Digital converter and digital Delta Sigma bit converters. In the ADC, the sense voltage of motor current is converted to 2 bits data with 25MHz over-sampling method. This data is added with 16 bits motor controlled digital signal and then it is converted to 2 bits data. After some digital signal processing, the data is down sampled to lower frequency after decimation filter. Then it's transferred to the PWM pulses for driving VCM. To reduce the number of gates without degrade the error level, LUT (Look Up Table) and the 2 bits converters are used at many circuit blocks.
社団法人電子情報通信学会の論文
2007-12-06