Patent ID: 7082004
Filing Date: 2006-07-25
Classification: G11B

Abstract:
1. A hard disk drive system comprising: a read head; a signal line connected at one end thereof respectively to both ends of the read head; and an amplifying circuit which is connected to the other end of the signal line to amplify and output a read signal formed by the read head, wherein the amplifying circuit comprising: a head bias circuit connected electrically to the other end of the signal line to apply a sense current to the read head; a first and a second capacitance elements connected electrically with the other end of the signal line to allow a signal element of the read signal formed by the read head to pass; a differential amplifying element for receiving at an input terminal thereof the read signal having passed the first and second capacitance elements; a transconductor for converting the read signal amplified with the differential amplifying element into a current; and a positive feedback loop for feeding back the read signal converted to the current with the transconductor to the input terminal of the differential amplifying element.