use pmos as a switch

[gone]

hi all,

i want to use pmos as a switch , when the gate voltage is 0, the switch is closed, when the gate voltage is 1, the switch is open.

however, when i really implement it in hspice, it cant function as a switch, even i applied high voltage to the gate, but it cant block the current.

what is the cause of this problem?

thanks

 

[alexan_e]

what is the cause of this problem?

What is the schematic and the voltages involved?