公开(公告)号：US20090147408A1

公开(公告)日：2009-06-11

申请号：US12199244

申请日：2008-08-27

申请人： Nobuyoshi Yamasaki

发明人： Nobuyoshi Yamasaki

IPC分类号： G11B5/33

CPC分类号： G11B5/09 ,  G11B20/10009 ,  G11B20/10027 ,  G11B20/10194 ,  G11B20/10481 ,  G11B2220/2516

摘要： A head IC adjusts an amplitude level of a read signal of a head and outputs the adjusted signal to a read channel having an AGC amplifier. A head IC includes: a differential amplifier; an AGC circuit; external gain setting sections; and a switch. The AGC amplifier is disposed in the head IC, and the amplitude from the head is automatically adjusted in the head IC. The signal level can be adjusted within the input dynamic range of the AGC amplifier of the read channel. An estimated gain value converted from a result of measuring a resistance value of the head is used as an initial value for the adjustment of the AGC amplifier. It becomes possible attempting to prevent an increase in the lock-in times of the AGC, to guarantee stability, and to prevent judgment errors of the AGC.

摘要翻译： 头IC调节头的读信号的幅度电平，并将调整后的信号输出到具有AGC放大器的读通道。 头IC包括：差分放大器; 一个AGC电路; 外部增益设定部分; 和开关。 AGC放大器设置在头IC中，并且头部IC中的幅度自动调节。 可以在读通道的AGC放大器的输入动态范围内调整信号电平。 将从头部的电阻值的测量结果转换出的估计增益值用作AGC放大器的调整的初始值。 可以尝试防止AGC的锁定时间的增加，以保证稳定性，并且防止AGC的判断错误。