| 摘要 |
Analog bidirectional switches ( 20 ) comprising a first ( 1 ) and a second ( 2 ) transistor function badly in case of the signal voltage at an input or an output of the switch ( 20 ) exceeding the supply voltage used for operating the switch ( 20 ). By providing the switch ( 20 ) with a circuit ( 21 ), a second control signal ("f") destined for the second transistor ( 2 ) is no longer generated by solely inverting a first control signal ("e") destined for the first tranistor ( 1 ), but is generated in response to the first control signal ("e") and by taking into account the in/output signal ("z") at an in/output of the switch ( 20 ). The circuit ( 21 ) comprises a generator ( 22 ) for generating the second control signal ("f") having either a fixed value or a value of the in/output signal ("z"), and comprises a detector ( 23 ) for supplying the in/output signal ("z") to the generator ( 22 ). A further circuit ( 24 ) comprises a further generator for generating a backgate signal ("bg") destined for the second transistor ( 2 ).
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