Patent ID: 7486140
Filing Date: 2009-02-03
Classification: G11C,H03F

Abstract:
1. A differential amplifier, comprising: a first and second transistor to which the inputs to the differential amplifier are respectively provided; first and second current sources each connected between a ground and each terminal of said first and second transistors which provides the output point of said differential amplifier; and first and second current mirror circuits each of which comprises third and fourth transistors and delivers the output of the differential amplifier to the load side by means of an electric current, the third transistor being connected to one of the first and second transistors and to which a monitor current flows in the current mirror circuit, and the fourth transistor to which a copy current flows in the current mirror circuit; a fifth transistor being connected between said fourth transistor and a resistor as the load, and to which the output of the differential amplifier is delivered, the fifth transistor being turned off when one of the inputs of the first and second transistors is low (L); and a third current source connected between the ground and the connection point of the fourth transistor and the fifth transistor.