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squirrel
Joined: 30 Oct 2005
Posts: 75
Helped: 3
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 25 Jan 2007 8:38 inverter design ---- equal rise time and fall time |
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hello... i need to design an inverter in microwind. the requirement is that the interver should have equal rise time & fall time.. .... how can i manage this (changing w/l ratio or what)?
please help
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hung_wai_ming@hotmail.com
Joined: 05 Jan 2004
Posts: 364
Helped: 39
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| 05 Mar 2007 18:15 inverter design ---- equal rise time and fall time |
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| by source/sink current calibration or use current mirror to bias the output inverter stage
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sivakumar_tumma
Joined: 27 Jan 2007
Posts: 215
Helped: 7
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| 09 Mar 2007 12:28 Re: inverter design ---- equal rise time and fall time |
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| squirrel wrote: |
hello... i need to design an inverter in microwind. the requirement is that the interver should have equal rise time & fall time.. .... how can i manage this (changing w/l ratio or what)?
please help |
By changing the W/L ratios accoding to mobilities of holes and electrons, the delay can be matched in both cases....
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srieda
Joined: 24 Dec 2006
Posts: 163
Helped: 17
Location: India
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| 14 Apr 2007 10:01 Re: inverter design ---- equal rise time and fall time |
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| (W/L)p / (W/L)n = µn/µp
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pad_rknec
Joined: 22 Apr 2007
Posts: 1
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| 02 May 2007 8:17 Re: inverter design ---- equal rise time and fall time |
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By changing the W/L ratios.
Wp(PMOS) = 2.5 to 3 times Wn(NMOS)
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RDRyan
Joined: 24 May 2007
Posts: 134
Helped: 17
Location: China
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| 03 Jun 2007 9:05 inverter design ---- equal rise time and fall time |
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| If the inverter has the equal rise and fall time, then the charge and discharge current of the inverter's load capacator should be the same. So the aim is to choose the right W/L ratio of PMOS and NMOS, let the current of them to be equal.
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ameed
Joined: 28 Jun 2007
Posts: 119
Helped: 5
Location: INDIA
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| 23 Aug 2007 10:39 Re: inverter design ---- equal rise time and fall time |
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hi,
By changing the W/L ratios.
Wp(PMOS) = 2.5 to 3 times Wn(NMOS)
according to this relations you can set equal tr and tf.
thanx.......
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