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ilikebbs
Joined: 30 Nov 2002
Posts: 80
Helped: 2
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 26 Jun 2008 18:08 question about P-MOSFET |
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when P-MOSFET is off(Vgs=0), is the voltage at D equal to the voltage at S because of the parasitical diode?
and the leakage current will be uA level.
Is my understanding right?
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Audioguru
Joined: 19 Jan 2008
Posts: 379
Helped: 22
Location: Canada
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| 27 Jun 2008 4:24 question about P-MOSFET |
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When a Mosfet is turned on, its Drain voltage is near its Source voltage. When it is turned off then the circuit's resistors and power supply determine the voltages.
In most circuits, the parasitic diode in a Mosfet never conducts.
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midgariano
Joined: 08 May 2008
Posts: 5
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| 27 Jun 2008 4:54 Re: question about P-MOSFET |
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| When VGS = 0, the transistor is off, it means that the current dosen't flow across the transistor, for, but it dosen't mean that the voltage VDS is equal to cero (VDS=0), because all the elements conected to the drain an the source, fo example ground or a resistor and Vdd, define the voltaje in this two terminals of the transistor; and, the parasitic diode of the transistor in the cases dosen't conduts.
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octocreation
Joined: 22 Jun 2006
Posts: 18
Helped: 1
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| 01 Jul 2008 8:57 question about P-MOSFET |
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Hi,
well if u r talking about PMOS, we generally refer to VSG and not VGS.......
regds,
Anup
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A.Anand Srinivasan
Joined: 15 Oct 2005
Posts: 1728
Helped: 205
Location: India
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| 02 Jul 2008 17:06 question about P-MOSFET |
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the voltages may be different...
Which leakage are u talking about???
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santom
Joined: 09 Sep 2007
Posts: 59
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| 03 Jul 2008 1:46 question about P-MOSFET |
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@Anand, Can you please give a clear explanation about this question as usual please..
Thank u all
Regards
santom
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A.Anand Srinivasan
Joined: 15 Oct 2005
Posts: 1728
Helped: 205
Location: India
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| 06 Jul 2008 18:12 question about P-MOSFET |
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| when the PMOS is off( condition given) there is no connection between the source and the drain and so the drain and source can be kept at diff voltages provided that we take care that the voltage between drain and source doesn't reach the point where punchthrough occurs...
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santom
Joined: 09 Sep 2007
Posts: 59
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| 09 Jul 2008 0:18 question about P-MOSFET |
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| Thanks @Anand..
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