Patent ID: 6603356
Filing Date: 2003-08-05
Classification: H03F

Abstract:
A method for controlling a quiescent current of an amplifier, the amplifier including a preamplifier, error amplifiers coupled to the preamplifier, and output devices driven by the error amplifiers, the error amplifiers having an input-referred offset voltage, said method comprising:applying a calibration voltage to an input of the error amplifiers; calibrating a quiescent current of the output devices by changing the calibration voltage so that the calibrated quiescent current has a predetermined current value, the calibration voltage corresponding to the calibrated quiescent current being set as a correction voltage; electrically disconnecting differential inputs of the amplifier from a signal input port and short-circuiting the differential inputs during said applying and said calibrating; and operating the amplifier with the correction voltage applied to the input of the error amplifiers.