The invention discloses a rectifier. The rectifier includes a first and a second input terminal, a first output terminal and at least one rectifying circuit. Each rectifying circuit including: a switching circuit including a transistor, and a driving circuit. The driving circuit is coupled to the switching circuit and controls a switching status of the switching circuit, and includes a totem-polecircuit and an input transistor. The totem-pole circuit includes an input terminal and an output terminal coupled to the transistor. The input transistor is coupled between the totem-pole circuit andthe switching circuit. The at least one rectifying circuit includes a first and a second rectifying circuit. The transistors of the first rectifying circuit and the second rectifying circuit are coupled to the first output terminal. The input transistors of the first rectifying circuit and the second rectifying circuit are coupled to the first input terminal and the second input terminal, respectively. The invention also discloses an associated rectifying circuit.