High-frequency integrated circuit

A high-frequency integrated circuit comprising:

• a first switch circuit which controls conduction between a first node and a second node according to a potential applied to a first control node;
• a second switch circuit which controls conduction between the first control node and a first potential node according to a potential applied to a second control node;
• and
• a first circuit including a first output node, a second output node, a third node, a third switch circuit, and a first potential circuit, wherein
• the first potential circuit outputs a first potential at the third node,
• the first output node is coupled to the first control node,
• the second output node is coupled to the second control node, and
• the third switch circuit is provided between the third node and the first output node, is configured to vary an impedance between the third node and the first output node, and is brought into conduction exclusively with the second switch circuit.

A high-frequency integrated circuit comprising:

• a first switch circuit which controls conduction between a first node and a second node according to a potential applied to a first control node;
• a second switch circuit which controls conduction between the first control node and a first potential node according to a potential applied to a second control node;
• and
• a first circuit including a first output node, a second output node, a third node, and a variable impedance circuit, wherein
• the first output node is coupled to the first control node,
• the second output node is coupled to the second control node,
• the variable impedance circuit is provided between the third node and the first output node, and is configured to vary an impedance between the third node and the first output node, and
• the impedance between the third node and the first output node becomes low exclusively with an impedance of the second switch circuit.