Patent ID: 6118611
Filing Date: 2000-09-12
Classification: G11B

Abstract:
A signal reproducing circuit for a magneto-resistive effect head, comprising:first and second power lines to which different voltages are applied;a connection line to which said first power line and one terminal of a magneto-resistive effect head for reproducing a signal from a magnetic recording medium in a read state are connected via a resistor;a first constant current source, connected to the other terminal of said magneto-resistive effect head via a resistor and connected between said resistor and said second power line, for supplying a sense current to said magneto-resistive effect head in the read state;a pair of transistors having collectors thereof connected to said first power line via resistors and responding to a voltage developed at one terminal of said magneto-resistive effect head and the other terminal thereof;second and third constant current sources, connected between the emitters of said pair of transistors and said second power line, for supplying a constant current to said pair of transistors in the read state;a capacitor connected between the emitters of said pair of transistors;fourth and fifth constant current sources connected in parallel with said second and third constant current sources; anda circuit for giving control so that when switching from an idle state to the read state is commanded, said fourth and fifth constant current sources remain on for a given period of time.