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本文示出了3.2GB集合形磁盘装置主要外围电路的定位电路和读写电路的设计、性能。对摇摆式定位方式(惯性矩为1000kg·mm~2)的磁头定位电路已实现了磁道间距23.5μm,平均存取时间为18ms。为了获得抗高频机械振动、抗外界干扰,高精度跟踪的功能,采取以下措施:(1)采用超前滞后2级补偿和积分补偿同时并用的回路设计,(2)采用了2相位置信号方式,从而达到了几百Hz的跟踪带域,并实现了0.7kg/μm的高刚性以及±0.5/μm的跟踪精度。另外,在读/写电路的设计中,为了提高溅射型、镀型等介质的数据鉴别能力,达到了如下性能:(1)介质信号质量与调制方式的配合及通道最佳化,(2)用扩大余弦均衡的数据分辨冗余度,使之达到扩展相位裕度20ns以上(溅射型介质,MFM调制方式)。
This article shows the design and performance of the positioning circuit and the read / write circuit of the main peripheral circuit of the 3.2GB integrated disk device. The magnetic head positioning circuit for the swing positioning method (moment of inertia of 1000 kg · mm ~ 2) has realized the track pitch of 23.5 μm and the average access time of 18 ms. In order to obtain anti-high-frequency mechanical vibration, anti-interference, high-precision tracking function, take the following measures: (1) the use of advanced and lag behind the two compensation and integral compensation circuit design used in conjunction, (2) Resulting in a tracking band of several hundred Hz and high stiffness of 0.7 kg / μm and tracking accuracy of ± 0.5 / μm. In addition, in the design of read / write circuits, in order to improve the data discrimination ability of the sputtered type, plated type and other media, the following performances are achieved: (1) the cooperation of the signal quality and the modulation mode of the medium and the optimization of the channel; (2) With extended cosine equalization of data resolution redundancy, to reach the extended phase margin of 20ns or more (sputtering media, MFM modulation).