| 摘要 |
An electronic circuit has a signal conductor ( 11 ), a power supply reference conductor ( 10 ) connected by a switching circuit. The switching circuit contains a PMOS transistor ( 17 ) and an NMOS transistor realized on a common substrate ( 100 ). The NMOS transistor ( 17 ) has a source coupled to the power supply reference conductor ( 10 ). The NMOS transistor ( 18 ) has a source coupled to the drain of the PMOS transistor ( 17 ), and a drain coupled to the signal conductor ( 11 ). A control circuit ( 13, 14, 15, 16 ) switches between an "on" state and an "off" state, in which the control circuit ( 13, 14, 15, 16 ) controls the gate source voltages of the first and second MOS transistor ( 17, 18 ) to make channels of these MOS transistors ( 17, 18 ) conductive and not to make the channels of these first and second transistors ( 17, 18 ) conductive respectively. Preferably a complementary switching circuit is also provided. The complementary switching circuit uses opposite polarity voltage differences, an NMOS transistor ( 27 ) coupled to a second power supply and a PMOS transistor ( 28 ) coupled to a signal conductor. The on resistances of the switching circuits are matched by matching the NMOS gate-source voltages, as well as the PMOS gate source voltages.
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