VARIABLE GAIN AMPLIFYING APPARATUS

摘要

PURPOSE: A variable gain amplifier is provided to prevent a non-linear output property of a switching element by generating a control voltage controlling a Gm cell part. CONSTITUTION: A first current mirror(310) makes currents on first and second routes provided from the power source be mirrored. A current controller(320) performs a control operation in order to generate a differential current corresponding to a difference between bypassed currents from a first current. A termination current generating part(330) outputs a termination current of a preset size. A compensation current control part(340) inputs the termination current of the preset size to a termination current generating part by controlling the flow of a compensating current. A drive voltage generation part(350) provides a first driving voltage and a second driving voltage. A control voltage generation part(360) provides a control voltage to the compensation current control part. A second current mirror(370) makes the differential current and the control current be mirrored.