Voltage buffer

The invention discloses a voltage buffer. The voltage buffer comprises first to sixth transistors, and first and second feedback branches; grid electrodes of the first transistor and the second transistor are respectively connected with a pair of differential input signals, source electrodes of the first transistor and the second transistor respectively output a pair of differential output signals, drain electrodes of the first transistor and the second transistor are respectively connected with a power supply end through the fifth transistor and the sixth transistor, a source electrode of the first transistor is connected with a drain electrode of the third transistor, and a source electrode of the second transistor is connected with a drain electrode of the fourth transistor. Source electrodes of the third transistor and the fourth transistor are connected with the ground end. The first feedback branch comprises seventh to ninth transistors, a first current source and a first resistor. The second feedback b