Patent ID: 8283968

Claim:
An analog switch comprising: at least one first MOS transistor capable of transferring a signal applied to a first terminal to a second terminal, without a capacitive element between the first terminal and the second terminal; a connection circuit for bringing a substrate terminal of said first transistor to a voltage which is a function of the voltages of the first and second terminals; a control circuit coupled to a first supply terminal, to said first terminal and to a control terminal of said first transistor for controlling a control voltage of said first transistor with said signal; and an auxiliary circuit to have the analog switch pass from an on state to an off state in response to a logic signal, wherein the auxiliary circuit comprises fifth and sixth MOS transistors, the fifth transistor having a first conduction terminal connected to a first node common with a substrate terminal of the first transistor, a control terminal connected to an input terminal receiving the logic signal, and the sixth transistor having a control terminal connected to the input terminal and a first conduction terminal connected to the control terminal of said first transistor and directly connected to the second terminal, wherein the connection circuit comprises a third and a fourth MOS transistors series-assembled between two conduction terminals of the first transistor, the third and fourth transistors having control terminals connected to the control circuit, and each having a substrate terminal and at least one conduction terminal connected to the first node, and wherein the first conduction terminal of the sixth transistor is directly connected to the control terminals of the third and fourth transistors.