Patent ID: 6522491
Filing Date: 2003-02-18
Classification: G01R,G11B

Abstract:
A magnetoresistive element input circuit having an active mode and an inactive mode, the input circuit comprising:a first resistor connected between a magnetoresistive element and a first power source; a first current source connected between the magnetoresistive element and a second power source for supplying a DC bias current to the magnetoresistive element in the active mode; a second resistor connected between the magnetoresistive element and the first current source; a capacitor connected to a node between the second resistor and the first current source and to the first power supply; a differential amplifier connected to the magnetoresistive element; and a voltage supply circuit connected to the node for supplying the node, when the input circuit is in the inactive mode, with a voltage substantially equal to that supplied to the node when the input circuit is in the active mode.