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How to draw admitance point, series and open stub length in Smith Chart

Question asked by nimbargi on Nov 11, 2013
Latest reply on Nov 12, 2013 by nimbargi

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Dear Sir,
             I want to find the series length and open stub length for the David .M.Pozer example 11.3 using Smith Chart. I know, how to find the Gamma_S and Gamma_L. I don't know , how to find the admittance point Ys , and how to draw the series length and open stub length as shown in the example of the David .M.Pozer (page # 551 and page #552 of David M.Pozer 3rd edition). Please help me to draw the Smith chart.

         I want to draw it admittance point, series and open stub length in the ADS SMITH CHART utility graph using ADS software, not manual Smith chart graph .

Edited by: nimbargi on Nov 11, 2013 10:15 AM

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POZER_Smith_Chart.jpg933.4 KB

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nimbargi Nov 12, 2013 2:09 AM

sir,
Please help me someone

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volker_muehlhaus @ nimbargi on Nov 12, 2013 3:18 AM

It is difficult to understand what you need (especially without having the book).

Have you seen the Smith Chart Tool in ADS? In the schematic, go to Tools > Smith Chart.

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nimbargi @ volker_muehlhaus on Nov 12, 2013 5:39 AM

Volker_Muelhus Sir,
Yes I have seen and drawn also. I know how to find the Gamma_S and Admittance point. Now I am facing the difficulty in drawing the series length and open stub length for low noise amplifier design , once we find the Gamma_S value and Admittance value. In images, I have shown Pozer_Example_Description_3, similarly I need to find the series length and open stub length for low noise amplifier design(not exactly shown in Pozer example).Manually we can draw it very easily using Smith chart graph, it is difficult to draw for beginners using ADS Smith chart utility. I am attaching all related files along AMPLIFIER CHAPTER of POZER, you can go through

Edited by: nimbargi on Nov 12, 2013 6:05 AM

Edited by: nimbargi on Nov 12, 2013 6:38 AM

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Pozer_Example_11.3_description_1.jpg569.0 KB
Pozer_Example_description_2.jpg438.7 KB
Pozer_Example_Description_3.jpg913.8 KB
Pozer_Example_Description_4.jpg330.9 KB
ADS_UTILITY_Gamma_SValue.jpg611.2 KB
ADS_Ultility_Admitance_Point.jpg593.1 KB

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volker_muehlhaus @ nimbargi on Nov 12, 2013 5:23 AM

> {quote:title=nimbargi wrote:}{quote}
> Now I am facing the difficulty in drawing the series length and open stub length

I don't understand what your problem is.

You have shown the Smith tool screenshot with source and load impedance, without any matching elements.
Is your problem in understanding how to do matching with the Smith chart (theory), or how to apply the theory to this tool (user interface).
Or is your problem the conversion from electrical line parameters to physical dimensions?

~~

I think you should remove the book download above, for copyright reasons.

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nimbargi @ volker_muehlhaus on Nov 12, 2013 5:37 AM

Volker Sir,
I have problem with drawing the matching series length and open stub length, once we know the Gamma_S using ADS Smith chart utility.
Yes I will remove the POZER chapter due to copyright material.

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volker_muehlhaus @ nimbargi on Nov 12, 2013 6:08 AM

> {quote:title=nimbargi wrote:}{quote}
> I have problem with drawing the matching series length and open stub length

Not sure if I understand what you mean by "drawing" in this context, but try this:
http://www.microwaves101.com/encyclopedia/smithchart.cfm

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nimbargi @ volker_muehlhaus on Nov 12, 2013 9:59 AM

Sir,
I have gone through that link material, it is not much useful for our need. Can any help me to find the matching series and open stub length, if we know Gamma_S and Admittance point.

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7 Replies

nimbargi Nov 12, 2013 2:09 AM
Mark Correct
Correct Answer
sir,
Please help me someone
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- volker_muehlhaus @ nimbargi on Nov 12, 2013 3:18 AM
  Mark Correct
  Correct Answer
  It is difficult to understand what you need (especially without having the book).
  
  Have you seen the Smith Chart Tool in ADS? In the schematic, go to Tools > Smith Chart.
  Like • Show 0 Likes0
  Actions
  - nimbargi @ volker_muehlhaus on Nov 12, 2013 5:39 AM
    Mark Correct
    Correct Answer
    Volker_Muelhus Sir,
    Yes I have seen and drawn also. I know how to find the Gamma_S and Admittance point. Now I am facing the difficulty in drawing the series length and open stub length for low noise amplifier design , once we find the Gamma_S value and Admittance value. In images, I have shown Pozer_Example_Description_3, similarly I need to find the series length and open stub length for low noise amplifier design(not exactly shown in Pozer example).Manually we can draw it very easily using Smith chart graph, it is difficult to draw for beginners using ADS Smith chart utility. I am attaching all related files along AMPLIFIER CHAPTER of POZER, you can go through
    
    Edited by: nimbargi on Nov 12, 2013 6:05 AM
    
    Edited by: nimbargi on Nov 12, 2013 6:38 AM
    Attachments
    Pozer_Example_11.3_description_1.jpg569.0 KB
    Pozer_Example_description_2.jpg438.7 KB
    Pozer_Example_Description_3.jpg913.8 KB
    Pozer_Example_Description_4.jpg330.9 KB
    ADS_UTILITY_Gamma_SValue.jpg611.2 KB
    ADS_Ultility_Admitance_Point.jpg593.1 KB
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    - volker_muehlhaus @ nimbargi on Nov 12, 2013 5:23 AM
      Mark Correct
      Correct Answer
      > {quote:title=nimbargi wrote:}{quote}
      > Now I am facing the difficulty in drawing the series length and open stub length
      
      I don't understand what your problem is.
      
      You have shown the Smith tool screenshot with source and load impedance, without any matching elements.
      Is your problem in understanding how to do matching with the Smith chart (theory), or how to apply the theory to this tool (user interface).
      Or is your problem the conversion from electrical line parameters to physical dimensions?
      
      ~~
      
      I think you should remove the book download above, for copyright reasons.
      Like • Show 0 Likes0
      Actions
      - nimbargi @ volker_muehlhaus on Nov 12, 2013 5:37 AM
        Mark Correct
        Correct Answer
        Volker Sir,
                      I have problem with drawing the matching series length and open stub length, once we know the Gamma_S using ADS Smith chart utility.
                  Yes I will remove the POZER chapter due to copyright material.
        Like • Show 0 Likes0
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        volker_muehlhaus @ nimbargi on Nov 12, 2013 6:08 AM
        Mark Correct
        Correct Answer
        > {quote:title=nimbargi wrote:}{quote}
        >                I have problem with drawing the matching series length and open stub length
        
        Not sure if I understand what you mean by "drawing" in this context, but try this:
        http://www.microwaves101.com/encyclopedia/smithchart.cfm
        Like • Show 0 Likes0
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        nimbargi @ volker_muehlhaus on Nov 12, 2013 9:59 AM
        Mark Correct
        Correct Answer
        Sir,
              I have gone through that link material, it is not much useful for our need. Can any help me to find the matching series and open stub length, if we know Gamma_S and Admittance point.
        Like • Show 0 Likes0
        Actions

How to draw admitance point, series and open stub length in Smith Chart

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