公开(公告)号：JPH11238212A

公开(公告)日：1999-08-31

申请号：JP4025598

申请日：1998-02-23

Applicant: IBM

Inventor： TSUNAKO KAZUJI ,  AMANO YOSHIRO ,  MATSUI TAKAO ,  MIURA TAKESHI

IPC: G11B5/09 ,  G11B5/012 ,  G11B5/02 ,  G11B5/40 ,  G11B5/48 ,  G11B33/12 ,  H05K1/02 ,  H05K1/18

Abstract: PROBLEM TO BE SOLVED: To enhance the electrostatic discharge resistance of a device without degrading the high frequency characteristic of the device by amplifying the detection output of a magneto-resistance effect type sensor whose one end is grounded and connecting a nonlinear conductive element in between a power source voltage line supplying a power source voltage and a grounding line. SOLUTION: A varistor 30 is provided in between a power source voltage line supplying a power source voltage and a grounding line on a control substrate 20. Moreover, on the substrate 20, a capacitor 31 is provided in parrallel with the varistor 30 and, further, an inductance 32 inserted in series with the power source voltage line is provided. The varistor 30 has a capacitive component and the capacitive component, the capacitor 31 and the inductance 32 function as a low-pass filter eliminating noise being on the power source voltage line. Thus, a high frequency component being in a power source voltage to be supplied to an AE7 is reduced and they contribute to the stable operation of the AE7. Furthermore, the miniatirizing of the capacitor 31 is made possible by the capacitance of the varistor 30.