Amplifying circuit having cancelling circuit coupled on op-amp lead-out

The invention relates to an amplifying circuit, comprising an operation amplifier and a compensation circuit. The operation amplifier comprises an intensifier stage used to amplify the input signals to achieve amplified signals and an output stage coupled to the output end of the intensifier stage to receive the amplified signals and generate output signals according to the amplified signals. The compensation circuit is coupled to the output stage and the intensifier stage to generate compensation signals in accordance to the output signals, and feed the compensation signals back to the output end of the intensifier stage to compensate the amplified signals.