Transistor switch circuit

The invention provides a transistor switch circuit which includes a first transistor coupled between an input terminal and an output terminal and configured to control transmission and interruption ofa signal between the input terminal and the output terminal; and a set of serially-connected transistors parallel to the first transistor and coupled between the input terminal and the output terminal, the set of serially-connected transistors comprising a plurality of transistors which are back-to-back connected, wherein a body terminal of each of the plurality of transistors is coupled to a first body terminal of the first transistor, and a control terminal of the first transistor and the control terminals of the plurality of transistors receive the same control signal. By the configurationof the set of serially-connected transistors, the conduction paths of the body diodes of the first transistor can be cut and the body effect thereof is eliminated. Hence, the output signal is prevented from leaking via the co