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engrbabarmansoor
Joined: 18 Jan 2007
Posts: 33
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 20 Feb 2007 13:37 short circuit current |
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| what is short circuit current in a CMOS inverter?
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leotim
Joined: 13 Jul 2005
Posts: 346
Helped: 5
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| 20 Feb 2007 14:09 Re: short circuit current |
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If you inverter means NOT logic gate:
When the output of an inverter is shorted (directly connected) to ground while input in logic 0 (or to VDD while input is logic 1), the output current is called "short circuit current".
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sivakumar_tumma
Joined: 27 Jan 2007
Posts: 215
Helped: 7
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| 09 Mar 2007 13:32 Re: short circuit current |
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| engrbabarmansoor wrote: |
| what is short circuit current in a CMOS inverter? |
The pulse to the inverter is not ideal square wave . there will be some rise and fall times.
similarly there will dealy in the response of NMOS and PMOS.
Because of these, there will be chance of ,for sometime, both the NMOS and PMOS will be on, shorting the Vdd to the ground. Since the impednace is less, there will large current passing through the inverter.
This current is called shortcircuit current.
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barmak
Joined: 28 Apr 2007
Posts: 73
Helped: 2
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| 22 May 2007 11:42 Re: short circuit current |
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| short circuit currrent in any block with output usually means the maximum current that output can give for long time when output is connected to ground
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RDRyan
Joined: 24 May 2007
Posts: 134
Helped: 17
Location: China
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| 18 Jun 2007 14:19 short circuit current |
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I agree with sivakumar_tumma
I think short circuit current is the current from VDD to VSS when both PMOS and NMOS are turned on.
When the input is from low to high or high to low, the input of voltage of the inverter will reach a middle voltage between VDD and VSS, and then the PMOS and NMOS of inverter both are turn on. and the static current from VDD to VSS is very large.
Ryan
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turbina
Joined: 10 Jun 2007
Posts: 57
Location: North Italy (Udine)
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| 11 Jul 2007 14:38 short circuit current |
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the value of cmos short current depends of vdd, .
at 5volts .....2-5milliamperes
at 15volts more think 10-15milliamperes
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santhosh.mandugula
Joined: 09 Oct 2007
Posts: 79
Helped: 3
Location: india
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| 27 Dec 2007 13:50 Re: short circuit current |
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| sivakumar_tumma wrote: |
| engrbabarmansoor wrote: |
| what is short circuit current in a CMOS inverter? |
The pulse to the inverter is not ideal square wave . there will be some rise and fall times.
similarly there will dealy in the response of NMOS and PMOS.
Because of these, there will be chance of ,for sometime, both the NMOS and PMOS will be on, shorting the Vdd to the ground. Since the impednace is less, there will large current passing through the inverter.
This current is called shortcircuit current. |
This will happen during rising and falling edges of the input signal.
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