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vivek1214
Joined: 18 Jun 2007
Posts: 105
Helped: 11
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 03 Feb 2008 18:29 budget analysis in ads |
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hi all,
how to get Budget Analysis in ADS when there are two path in receiver(I & Q).
thanks
vivek
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khouly
Joined: 20 Oct 2003
Posts: 2479
Helped: 343
Location: EGYPT
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04 Feb 2008 8:40 Budget Analysis in ADS for I-Q path in RF receiver |
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i think u can replace the Iand Q with single path
just to calculate the total NF , gain , and IIP3
then apply the result to I and Q
khouly
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vivek1214
Joined: 18 Jun 2007
Posts: 105
Helped: 11
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04 Feb 2008 12:50 Re: Budget Analysis in ADS for I-Q path in RF receiver |
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| khouly wrote: |
i think u can replace the Iand Q with single path
just to calculate the total NF , gain , and IIP3
then apply the result to I and Q
khouly |
Thanks khouly.
you mean to say I should consider only one path! is there any alternative of his actually i am getting error in defining second budget_path.
vivek
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khouly
Joined: 20 Oct 2003
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Helped: 343
Location: EGYPT
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04 Feb 2008 19:11 Budget Analysis in ADS for I-Q path in RF receiver |
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the second path is the same as the 1st , but the received power is divided to enter the 2 paths , so u can replace them with one path
khouly
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vivek1214
Joined: 18 Jun 2007
Posts: 105
Helped: 11
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05 Feb 2008 14:43 Re: Budget Analysis in ADS for I-Q path in RF receiver |
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[quote="khouly"]the second path is the same as the 1st , but the received power is divided to enter the 2 paths , so u can replace them with one path
Thanks Khouly
could you tell me how to calculate Image rejection ?it should be from I path or Q path.I am using tone of 2.44GHz for source,2.24GHz for Ist LO and 199MHz for second LO.and how to calculate IIIP3
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khouly
Joined: 20 Oct 2003
Posts: 2479
Helped: 343
Location: EGYPT
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05 Feb 2008 17:02 Budget Analysis in ADS for I-Q path in RF receiver |
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the Image rejection ratio : ratio between the gain of the desired channel to the gain of the image signal
is ur IQ paths after the 1st mixer , then calculate the power before the I and Q spliting , of both desried and image signals
check the image
khouly
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vivek1214
Joined: 18 Jun 2007
Posts: 105
Helped: 11
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05 Feb 2008 17:22 Re: Budget Analysis in ADS for I-Q path in RF receiver |
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| khouly wrote: |
the Image rejection ratio : ratio between the gain of the desired channel to the gain of the image signal
is ur IQ paths after the 1st mixer , then calculate the power before the I and Q spliting , of both desried and image signals
check the image
khouly |
Thanks Khouly for help.
But my problem is different in my case image rejection will be done after the I-Q splitting .Here I am attaching image pls check it and suggest me.
I Have one more problem in calculating NF, NFdeg, Gain using AC analysis is that while considering only one path what shoul I do with power splitter?f I keep it at same plca then what about its third port
Last edited by vivek1214 on 05 Feb 2008 20:28; edited 1 time in total |
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05 Feb 2008 17:22 Ads |
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khouly
Joined: 20 Oct 2003
Posts: 2479
Helped: 343
Location: EGYPT
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05 Feb 2008 20:11 Budget Analysis in ADS for I-Q path in RF receiver |
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the image rejection ratio can be calculated after the power combining , just before the BPF
i see ur using one of image rejection achitectures
about the noise figure and IIP3 , check the RF system design guide , and try to build ur own equations
specially ur architecture need alot of work to be created that way
khouly
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ADS_RFMW
Joined: 18 Aug 2005
Posts: 136
Helped: 4
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07 Feb 2008 9:34 Re: Budget Analysis in ADS for I-Q path in RF receiver |
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| Use equations to to RF cascaded budget analysis
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khouly
Joined: 20 Oct 2003
Posts: 2479
Helped: 343
Location: EGYPT
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07 Feb 2008 11:40 Budget Analysis in ADS for I-Q path in RF receiver |
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he can use the budget simulation in ADS , he need to use equations and AC and HB enginers
khouly
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vivek1214
Joined: 18 Jun 2007
Posts: 105
Helped: 11
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07 Feb 2008 15:33 Re: Budget Analysis in ADS for I-Q path in RF receiver |
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Khouly,
can you explain me what is ".t1",and ".t2" in equation format for the equation like
budget_path=["port1.t1","a1_amp.t2".................etc]
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khouly
Joined: 20 Oct 2003
Posts: 2479
Helped: 343
Location: EGYPT
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07 Feb 2008 16:00 Budget Analysis in ADS for I-Q path in RF receiver |
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send me , the project , u created , so i can check the equations
or tell me the steps , to create such a project
khouly
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vivek1214
Joined: 18 Jun 2007
Posts: 105
Helped: 11
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07 Feb 2008 17:19 Re: Budget Analysis in ADS for I-Q path in RF receiver |
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hello khouly,
can you send me your Email ID?
vivek
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vivek1214
Joined: 18 Jun 2007
Posts: 105
Helped: 11
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09 Feb 2008 17:11 Re: Budget Analysis in ADS for I-Q path in RF receiver |
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hello ,
now my problem has been solved.
can some one provide me RF design specification of bluetooth i am not able to get from bluetooth .org
thanks
vivek
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