Patent ID: 6674328
Filing Date: 2004-01-06
Classification: H03F

Abstract:
An amplifier circuit comprising:a differential amplifier unit which includes one or more differential amplifier circuits; a detector unit which detects a peak value of an output voltage of the differential amplifier unit; a generator unit which generates an offset compensation voltage for offset compensation based on a detection result of the detector unit; and a limiter unit which limits the offset compensation voltage generated by the generator unit into a predetermined range and feeds back the limited offset compensation voltage to the differential amplifier unit, wherein the detector unit detects the peak value and an intermediate value of the output voltage of the differential amplifier unit, generates a first reference voltage by adding a predetermined external voltage to a voltage of the intermediate value, and outputs the peak value and the first reference voltage to the generator unit, the generator unit generates the offset compensation voltage based on the peak value and the first reference voltage to the generator unit voltage fed from the generator unit.