Amplification circuit

The utility model discloses two amplification circuits, and belongs to the technical field of integrated circuit manufacturing. Comprising a current source IBN, a current source MP1, a current source MP2, a current source MP3, a current source MP4, a current source MN1, a current source MN2, a current source R1, a current source R2 and a current source R3; another amplification circuit capable of directly amplifying the level close to the power supply level comprises current sources IBP, MP1, MP2, MN1, MN2, MN3, MN4, R1, R2 and R3; each of the two ports comprises an input port VINP and an input port VINN, and an output port VO + and an output port VO-. Compared with the prior art, the utility model has the beneficial effects that the bias in the output quantity VOUT is effectively removed, so that the static power consumption of the whole circuit is greatly reduced, and an input signal close to a ground level or an input signal close to a power supply level can be directly amplified; in addition, the subseque