| 摘要 |
The invention relates to a switch assembly for switching through positive and negative voltages at an input to an output, said switch assembly being provided with two series connections (24, 26) which are connected in parallel and comprise two PMOS or two NMOS transistors (16, 18, 20, 22), which are connected between the input and the output. The sources and the substrates of the input-side PMOS and NMOS transistors (16, 20) are connected to the input terminal (12) and the sources and the substrates of the output-side PMOS and NMOS transistors (18, 22) are connected to the output terminal (14). When the input terminal (12) is to be blocked with respect to the output terminal (14), or vice versa, a control unit (42) applies a respective control voltage which is greater than the voltage at the input and output terminals (12, 14), less the threshold voltage of the respective PMOS transistor (16, 18), to the gate of the input-side PMOS transistor (16) and to the gate of the output-side PMOS transistor (18), and applies a control voltage which is smaller than the voltage at the input and output terminals (12, 14), plus the threshold voltage of the respective NMOS transistor (20, 22), to the gate of the input-side NMOS transistor (20) and to the gate of the output-side NMOS transistor (22). When the input terminal (12) is conductingly connected to the output terminal (14), the control unit (42) applies a respective control voltage which is less than the voltage at the input and output terminals (12, 14) by at least the threshold voltage of the respective PMOS transistor (16, 18), to the gate of the input-side PMOS transistor (16) and to the gate of the output-side PMOS transistor (18), and applies a control voltage which is greater than the voltage at the input and output terminals (12, 14) by at least the threshold voltage of the respective NMOS transistor (20, 22), to the gate of the input-side NMOS transistor (20) and to the gate of the output-side NMOS transistor (22). |
