POWER SOURCE CONTROL CIRCUIT

摘要

A power source control circuit which can efficiently prevent voltage distortion of an input signal during signal amplification. In the power source control circuit, a power source voltage of a direct current power source is supplied to an amplification circuit which alternately performs differential operation corresponding to a signal level of the input signal, while performing constant voltage control. The power source control circuit is provided with a first transistor wherein a collector is connected with the direct current power source and an emitter is connected with the amplification circuit for discharging current; an error amplifier, which is connected with a base of the first transistor at an output edge and performs feedback control so as to keep the difference between a prescribed reference potential and a first transistor emitter potential constant; and a current intake second transistor wherein the emitter and the base are connected common to the first transistor and the collector is grounded.