Patent ID: 6114905
Filing Date: 2000-09-05
Classification: G11B,H03F,Y10T

Abstract:
A magnetic disk storage apparatus comprising:a disk-like magnetic storage medium supplied with a first potential and storing information thereon;a read head using a magnetoresistance effect element which is used for reading said information on said disk-like magnetic storage medium and which is supplied at its one end with said first potential and outputs a read signal from the other end thereof;an amplifier circuit for amplifying said read signal formed by said read head; anda first bias circuit,wherein said amplifier circuit is a modified differential circuit including a first transistor of a first conductivity type and a second transistor of a second conductivity type each having a control terminal, a terminal on the input side and a terminal on the output side, in which the terminals on the input side are connected in common, and a current corresponding to the voltage difference across the control terminals is allowed to flow,wherein said first potential is applied to the output terminal of said first transistor, and said read signal generated by said read head is applied to said control terminal of said first transistor,wherein a bias voltage generated by the first bias circuit is applied to said control terminal of said second transistor, andwherein an amplified signal corresponding to said read signal is generated from the terminal of said second transistor on the output side.