公开(公告)号：WO1996008816A1

公开(公告)日：1996-03-21

申请号：PCT/US1995011535

申请日：1995-09-12

Applicant: ANALOG DEVICES, INC.

Inventor： ANALOG DEVICES, INC. ,  STEYAERT, Michel ,  DEHAENE, Wim ,  CRANINCKX, Jan ,  WALSH, Mairtin ,  REAL, Peter

IPC: G11B05/596

CPC classification number: G11B5/59655

Abstract: A servo system for controlling the position of a read/write head in a disk drive is provided. The servo system includes two input terminals for sequentially receiving a plurality of input signal AC voltage bursts of a burst pattern, wherein the input signal bursts include positional information of the head. Demodulation circuitry, coupled to the input terminals, sequentially demodulates each input signal burst and provides a demodulated signal for each burst. The demodulation circuitry includes translation circuitry, coupled to the input, for sequentially translating each input voltage burst to a translated current. A rectifier circuit, coupled to the translation circuitry, including an absolute value circuit and a current mirror circuit, sequentially rectifies each translated current and produces a driving signal. An integrator, coupled to the rectifier circuit, sequentially integrates each driving signal. The integrator includes an integration capacitor which is sequentially charged by each driving signal. In the preferred embodiment, the current mirror circuit includes an operational amplifier and a gain circuit. Also in the prefered embodiment, the voltage to current translation circuit includes a folded cascode circuit arrangement of a plurality of CMOS transistors.

Abstract translation: 提供了一种用于控制磁盘驱动器中读/写磁头的位置的伺服系统。 伺服系统包括两个输入端子，用于顺序地接收突发模式的多个输入信号AC电压脉冲串，其中输入信号脉冲串包括磁头的位置信息。 耦合到输入端的解调电路顺序地解调每个输入信号脉冲串，并为每个脉冲串提供解调信号。 解调电路包括耦合到输入的平移电路，用于将每个输入电压脉冲串顺序地转换成转换的电流。 耦合到包括绝对值电路和电流镜电路的平移电路的整流器电路顺序地对每个转换的电流进行整流并产生驱动信号。 耦合到整流电路的积分器顺序地对每个驱动信号进行积分。 积分器包括由每个驱动信号依次充电的积分电容器。 在优选实施例中，电流镜电路包括运算放大器和增益电路。 同样在优选实施例中，电压 - 电流转换电路包括多个CMOS晶体管的折叠共源共栅电路装置。