| 摘要 |
<p>PROBLEM TO BE SOLVED: To keep a sufficient isolation characteristic by eliminating the effect of a parasitic inductive component, even in the case that a high-frequency signal whose frequency is higher is an object of the circuit. SOLUTION: In the semiconductor switch circuit having a 1st FET 3 connected between input output terminals 1, 2 and a 2nd FET 7 conductively connected to the circuit when the 1st FET 3 is nonconductive, a capacitive element 15 in series resonance to an inductive component 14 in existence between a source of the 2nd FET 7 and a ground terminal 6 is connected between them. Thus, an excellent isolation characteristic is obtained by causing series resonance to the circuit for a frequency band of about 1.5GHZ, so as to reduce the impedance between the 2nd FET 7 and the ground. Furthermore, the inductive component 14 is set to a desired value by adjusting the inductance of bonding wires or lead frames of an IC chip.</p> |
