Switching circuit
First Claim
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1. A switching circuit comprising:
- a first transmission path;
a first input/output terminal connected to one end of said first transmission path;
a second input/output terminal connected to the other end of said first transmission path, said first transmission path including a first field effect transistor having a first conduction path which is connected at one end to said first input/output terminal;
a second field effect transistor having a second conduction path which is connected at one end to the other end of the first conduction path of said first field effect transistor and connected at the other end to said second input/output terminal; and
a first inductor connected in parallel with the first conduction path of said first field effect transistor, said second field effect transistor being devoid of a paralleled inductor;
a second transmission path connected at one end thereof to said second input/output terminal;
a third input/output terminal, which is isolated from said first input/output terminal, connected to the other end of said second transmission path; and
means for decreasing a difference between a voltage applied to the first conduction path of said first field effect transistor and a voltage applied to the second conduction path of said second field effect transistor, when said first and said second transistors are in an OFF state.
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Abstract
A switching circuit is made by serially connecting two field effect transistors in series in a small-signal transmission path, each of the transistors being applied with a substantially equal voltage, so as to lower a voltage applied to each of the FETs in the OFF state by voltage division, with the result that a high withstand voltage of the transmission path can be attained and a linear output can be obtained even when a large electric power is transmitted.
74 Citations
20 Claims
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1. A switching circuit comprising:
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a first transmission path; a first input/output terminal connected to one end of said first transmission path; a second input/output terminal connected to the other end of said first transmission path, said first transmission path including a first field effect transistor having a first conduction path which is connected at one end to said first input/output terminal;
a second field effect transistor having a second conduction path which is connected at one end to the other end of the first conduction path of said first field effect transistor and connected at the other end to said second input/output terminal; and
a first inductor connected in parallel with the first conduction path of said first field effect transistor, said second field effect transistor being devoid of a paralleled inductor;a second transmission path connected at one end thereof to said second input/output terminal; a third input/output terminal, which is isolated from said first input/output terminal, connected to the other end of said second transmission path; and means for decreasing a difference between a voltage applied to the first conduction path of said first field effect transistor and a voltage applied to the second conduction path of said second field effect transistor, when said first and said second transistors are in an OFF state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A switching circuit comprising:
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a first input/output terminal; a first field effect transistor having a first source electrode connected to said first input/output terminal, a first drain electrode and a first gate electrode; a first inductor connected between the first source electrode and the first drain electrode; a second field effect transistor having a second source electrode connected to the first drain electrode, a second drain electrode and a second gate electrode; a first control terminal for controlling conduction states of said first and said second field effect transistor; a first resistor connected between said first control terminal and the first gate electrode; a second resistor connected between said first control terminal and the second gate electrode; a second input/output terminal connected to the second drain electrode; a first voltage terminal for applying a reference potential; a third resistor connected between said voltage terminal and said second input/output terminal; a third field effect transistor having a third source electrode connected to said second input/output terminal, a third drain electrode and a third gate electrode; a second inductor connected between the third source electrode and the third drain electrode; a third input/output terminal connected to the third drain electrode; a second control terminal for controlling a conduction state of said third field effect transistor; and a fourth resistor connected between said second control terminal and the third gate electrode. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification