Importance

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Abstract

There is disclosed a semiconductor device, which allows the ripple rejection characteristics to be improved and the operating voltage to be reduced. The semiconductor device comprises a power supply circuit arranged between an input terminal and internal circuits so as to make a connection therebetween, said power supply circuit including a transistor Q.sub.41 for supplying each of the internal circuits with a drive voltage and another transistor Q.sub.44 for allowing a current to pass therethrough in response to a magnitude of a reference voltage supplied to a base thereof and a magnitude of the drive voltage supplied to an emitter thereof. A part of the circuit composed of transistors Q.sub.42, Q.sub.43 and a resistor R.sub.5 controls a current flowing through of the transistor Q.sub.41 based on the current that has passed though the transistor Q.sub.44, so that the drive voltage could be set to a value higher than the reference voltage approximately by a magnitude of a forward voltage between the base and the emitter of the transistor Q.sub.44.

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First Claim