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US 8,283,968 B2Granted
Analog switch
AssigneeSTMicroelectronics (Grenoble) SAS
InventorSerge Ramet
Life of this patent
Estimating the term…
Abstract
An analog switch including at least one first MOS transistor capable of transferring a signal from a first terminal to a second terminal; a connection circuit for bringing a substrate terminal of the first transistor to a voltage which is a function of the voltages of the first and second terminals; and a circuit for controlling a control voltage of the first transistor with the signal.
Claims11
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.
2 more elements
An analog switch comprising:
- at least one first transistor configured to transfer a signal from a first terminal to a second terminal terminal, without a capacitive element between the first terminal and the second terminal;
- a control circuit configured to control a voltage between the first terminal and a control terminal of the first transistor;
- and
- an auxiliary circuit configured to switch the analog switch from an on state to an off state in response to a logic signal, the auxiliary circuit including fifth and sixth transistors, the fifth transistor having a first conduction terminal connected to a substrate terminal of the first transistor and a control terminal connected to an input terminal configured to receive 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 the first transistor and directly connected to the second terminal, wherein the connection circuit comprises third and fourth transistors connected in series between two conduction terminals of the first transistor, the third and fourth transistors having control terminals connected to the control circuit, wherein the third and fourth transistors each have a substrate terminal and a conduction terminal connected to the substrate terminal of the first transistor, and wherein the first conduction terminal of the sixth transistor is directly connected to the control terminals of the third and fourth transistors.
1 more element
Dependencies are inferred from the claim text.