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In the pMOS transistor, the behavior and setup is the complement of the nMOS transistor. The body is held at positive voltage. When the gate is also positive - the source and drain are reverse-biased. When that happens, no current flows and we say the transistor is OFF. | In the pMOS transistor, the behavior and setup is the complement of the nMOS transistor. The body is held at positive voltage. When the gate is also positive - the source and drain are reverse-biased. When that happens, no current flows and we say the transistor is OFF. | ||
− | When the voltage at the gate is lowered, positive charges are attracted to the underside of the Si-SiO2 interface. When the voltage gets sufficiently low the channel gets inverted - creating a conducting path from the source to the drain, allowing current to flow. Because the behavior of a pMOS transistor is the opposite of that of an nMOS transistor, the symbol for pMOS transistor is identical to that of nMOS with an additional bubble on the gate. That bubble is known as an | + | When the voltage at the gate is lowered, positive charges are attracted to the underside of the Si-SiO2 interface. When the voltage gets sufficiently low the channel gets inverted - creating a conducting path from the source to the drain, allowing current to flow. Because the behavior of a pMOS transistor is the opposite of that of an nMOS transistor, the symbol for pMOS transistor is identical to that of nMOS with an additional bubble on the gate. That bubble is known as an inversion bubble. |
[[File:MOSFET flow.svg|center]] | [[File:MOSFET flow.svg|center]] | ||