| 摘要 |
PROBLEM TO BE SOLVED: To prevent simultaneous turning on at turning on/off selection by eliminating the need for a drive power supply for each reverse biasing in addition to a main power supply, even if a normally-on controllable switching means is used. SOLUTION: For example, N-channel junction-type FETs 11 and 14 and P-channel junction-type FETs 13 and 12 are provided, the drain of the FET 11 and the gate of the FET 13 are connected to a plus power supply line, both the sources of the FETs 11 and 13 are connected, both the gates of the FETs 11 and 12 are connected, both the drains of the FETs 13 and 14 are connected, both the sources of the FETs 12 and 14 are connected, and the drain of the FET 12 and the gate of the FET 14 are connected to a negative power supply line, thus achieving the aim.
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