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P-Channel E-Type MOSFET Switch Gate to Source Voltage Positive and Negative

P-Channel E-Type MOSFET Switch Gate to Source Voltage Positive and Negative:
MOSFET TYPE | VGS = +Ve (Positive) | VGS = 0 (Zero) | VGS = -Ve (Negative) |
---|---|---|---|
N-Channel Depletion TYpe MOSFET | ON | ON | OFF |
P-Channel Depletion Type MOSFET | OFF | ON | ON |
N-Channel Enhancement Type MOSFET | ON | OFF | OFF |
P-Channel Enhancement Type MOSFET | OFF | OFF | ON |
Three modes of Operating Region of Metal Oxide Semiconductor Field Effect Transistor [ MOSFET ] are:
- Linear Region (Ohmic)
- Saturation Region
- Cut-off Region
1- Linear Region Characteristics:
- In 'Linear Ohmic Region' , the transistor operate as an 'Variable Resistor', whose value is determined by the Gate Voltage, [ VGS ].
- The 'Gate to Source' Voltage [ VGS ] is greater than the Threshold Voltage [ VTH ]. i.e [ VGS > VTH ].
- The 'Drain to Source' Voltage [ VDS ] is greater than 'Gate to Source' Voltage [ VGS ] i.e [ VDS > VGS ]
2- Saturation Region Characteristics:
- In 'Saturation' region, the transistor operates as an 'Closed Switch'.
- The MOSFET is in its constant current region.
- The MOSFET is switched 'Fully-ON'.
- The 'Gate' Electrode is Connected to Supply Voltage [ VDD ].
- The 'Gate-Source' Voltage [ VGS ] is greater than Threshold Voltage [ VTH ] i.e [ VGS > VTH ].
- Maximum 'Drain' Current [ ID ] flows, i.e [ ID = VDD/RL ]
- This condition of transistor is act as a 'Fully-ON' and this is 'Saturation Region'.
- 'Drain to Source' Voltage [ VDS ] is approximately equal to Zero ideally. i.e [ VDS = 0V ].
- 'Drain to Source' Channel Resistance [ RDS(on) ] is Minimum. i.e [ RDS < 0.1 Ohms ].
- The MOSFET acts as a Closed Circuit.
3- Cut-Off Region Characteristics:
- In 'Cut-off' region, the transistor operates as an 'Open Switch'.
- The MOSFET is switched 'Fully-OFF'.
- The 'Gate' Electrode is Grounded to 'Zero' Voltage. [ 0V ].
- The 'Gate-Source' Voltage [ VGS ] is less than Threshold Voltage [ VTH ] i.e [ VGS < VTH ].
- No 'Drain' Current [ ID ] flows, i.e [ ID = 0A ].
- This condition of transistor is act as a 'Fully-OFF' and this is 'Cut-OFF Region'.
- 'Drain to Source' Voltage [ VDS ] is approximately equal to Supply Voltage. i.e [ VDS = VDD ].
- 'Drain to Source' Channel Resistance [ RDS(on) ] is Minimum. i.e [RDS < 0.1 Ohms ].
- The MOSFET acts as a open Circuit.