| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an SPDT switch semiconductor integrated circuit which eliminates the need to provide plural power sources even when a depletion type GaAs FET is used for logic. SOLUTION: This SPDT switch semiconductor integrated circuit 1 using a depletion type gallium arsenic field effect transistor is incorporated with on inverter circuit 4. Dividing resistors (R1 and R2) for input level adjustment are connected to the gate of a transistor T4 of the inverter circuit 4, at least one diode (D1, D2) is connected between the source and ground, and a transistor T3 for active loading or a load resistance is connected to the drain. Thus the output from the inverter circuit 4, i.e., the drain output of the transistor T4 controls the on/off of one switching transistor T2 of the SPDT switch.</p> |
