Patent ID: 7852158
Filing Date: 2010-12-14
Classification: H03F

Abstract:
1. An operational amplifier comprising: an operational amplification stage for amplifying a signal; a sampling capacitor connected to an input side of the operational amplification stage; a load unit driven by an output signal of the operational amplification stage; and a phase control circuit having a feedback capacitor connected in negative feedback between an output side of the operational amplification stage and the input side of the operational amplification stage, wherein: the phase control circuit includes a resistor unit connected in series to the feedback capacitor, the input side of the operational amplification stage includes a positive phase input terminal and a negative phase input terminal, the output side of the operational amplification stage includes a positive phase output terminal and a negative phase output terminal, the phase control circuit includes a first phase control circuit and a second phase control circuit, the first phase control circuit including a first feedback capacitor connected in negative feedback between the negative phase output terminal and the positive phase input terminal and a first resistor unit connected in series to the first feedback capacitor, and the second phase control circuit including a second feedback capacitor connected in negative feedback between the positive phase output terminal and the negative phase input terminal and a second resistor unit connected in series to the second feedback capacitor.