Abstract: A current mirror circuit includes a current input circuit, a current output circuit and a negative feedback circuit. A first terminal of the current input circuit receives input current, a second terminal of the current input circuit is coupled to a second terminal of the current output circuit, a first terminal of the current output circuit outputs mirror current. The negative feedback circuit includes a first transistor and a second transistor, a first terminal of the first transistor is coupled to a third terminal of the current input circuit, a second terminal of the first transistor is coupled to a second terminal of the second transistor. The first terminal of the second transistor is coupled to the third terminal of the current output circuit, the third terminal of the second transistor is grounded. The current mirror circuit improves the output impedance.