Common mode moving circuit for multipoint low voltage differential signal receiver

The invention provides a common mode moving circuit for a multipoint low voltage differential signal receiver. The common mode moving circuit comprises a first resistor, a second resistor and a current regulating circuit as well as an error amplifier, wherein the current regulating circuit is formed by a third and fourth resistors and first to sixth transistors; grids of the second and fifth transistors are in a short connection with a drain electrode; grids of the first, second and third transistors are connected with each other and the source ends are grounded; grids of the fourth, fifth and sixth transistors are connected and the source ends are connected with power supply voltage; drain ends of the first and fourth transistors are connected with the first resistance; the third and fourth resistance is in a serial connection between a drain end of the second transistor and a drain end of the fifth transistor; drain ends of the third and sixth transistors are connected with the second resistor; a difference-mode input end of the error amplifier is connected with a reference level; and a common mode input end is connected with the drain ends of the first and third transistors. No effects are caused to input signal differential value; and the common mode moving circuit has system noise ratio higher than a receiver using a compression network.