Analog switch circuit for wide frequency band
AssigneeFujitsu Semiconductor Limited
InventorsMinoru Hosoda, Mitsuo Kitamura
Life of this patent
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Abstract
An analog switch circuit that includes a first field-effect transistor, a source of which is coupled to a first switch terminal, and a drain of which is coupled to a second switch terminal; a first capacitance storing electric charge; a second capacitance storing electric charge; a first switch circuit that couples the first capacitance between a direct current voltage node and a reference potential node; a second switch circuit that couples the first capacitance and the second capacitance in parallel; and a third switch circuit that couples the second capacitance between a gate and the source of the first field-effect transistor.
Claims7
An analog switch circuit comprising:
- a first field-effect transistor, a source of which is coupled to a first switch terminal, and a drain of which is coupled to a second switch terminal;
- a first capacitance to store electric charge;
- a second capacitance to store electric charge;
- a first switching element that is coupled between the direct current voltage node and a first terminal of the first capacitance;
- a second switching element that is coupled between the reference potential node and a second terminal of the first capacitance;
- a third switching element that is coupled between the first terminal of the first capacitance and a first terminal of the second capacitance;
- a fourth switching element that is coupled between the second terminal of the first capacitance and a second terminal of the second capacitance;
- a fifth switching element that is coupled between the first terminal of the second capacitance and a gate of the first field-effect transistor;
- and
- a sixth switching element that is coupled between the second terminal of the second capacitance and the source of the first field-effect transistor.
Dependencies are inferred from the claim text.