Current mirror image circuit of built-in resistor type LED display driving chip

The invention discloses a current mirror image circuit of a built-in resistance type LED display driving chip, which belongs to the field of integrated circuits and comprises a reference current generation module and a current mirror image module; wherein the reference current generation module comprises an operational amplifier and a built-in adjustable resistance circuit; the current mirror image module comprises a first branch circuit and a second branch circuit which are composed of PMOS tubes; wherein the built-in adjustable resistance circuit configures the resistance value through a first control signal, and changes the current of the first branch circuit; and the second branch performs current mirroring of the first branch through a second control signal and a third control signal. According to the invention, the current of the built-in resistor type LED driving chip can be finely adjusted, and meanwhile, a certain current mirror image ratio can be provided, so that the requirement of wide range of ou