Patent ID: 6088460
Filing Date: 2000-07-11
Classification: H03G

Abstract:
An audio device comprising:first and second differential amplifiers which have a common load, a common output extracted via said common load, and a common input signal and respective separate current sources;a first negative feedback circuit which negative feeds back either a voltage signal extracted from said common output or a corresponding signal thereto to said first differential amplifier with substantially a flat frequency characteristic;a second negative feedback circuit having a filter characteristic of reducing negative feedback amount in a low frequency region which negative feeds back the voltage signal to said second differential amplifier; anda switch which turns ON/OFF the current of the current source for said second differential amplifier, wherein the negative feedback rate of said first negative feedback circuit is set larger than the negative feedback rate of said second negative feedback circuit and the ON/OFF of said switch is selected in response to an external operation therefor.