Analogue switch using complementary MOSFET's has 3 further MOSFET's with lower voltage threshold connected in series between switch input and output

摘要

The analogue switch has a pair of complementary MOSFET's (10,12) with their source-drain paths connected in parallel between the switch input (18) and the switch output (20), the control signal for the switch supplied directly to the gate of one MOSFET and supplied via a negator (16) to the gate of the other MOSFET. The source-drain paths of 3 further MOSFET's (22,24,26) with a lower threshold voltage are connected in series between the input and output of the switch, the center MOSFET of opposite type to the outer MOSFET's and the gates of all 3 MOSFET's coupled together.