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Type: Posts; User: BigBoss

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  1. Closed: Re: How to check different temperature values for design of LNA IN ADS.

    For Temperature, you have to place "Options" block and temp variable can be set in it..
    In order to sweep any biasing value, you should use "Parameter Sweep" block ..
    But first things first, you...
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    Closed: Re: microwave power combiner/divider

    The results are wrong..1/2 Power Divider must have at least -3dB Insertion Loss..
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    Closed: Re: microwave power combiner/divider

    Ports are not excited simultaneously by definition of s-parameters.The simulator does not do too..
    If this structure is a "Planar Wilkinson Power Divider", FDTD is a wrong choice for these type of...
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    Closed: Re: microwave power combiner/divider

    Combiners/Dividers are passive elements so they have losses, not gain..
    How did you simulate his combiner?? Which EM simulator have you used ?? What is your port and substrate configuration ??
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    Closed: Re: Need help on ADS inductor simulation

    This is not a Balun, it's a transformer with tapped pins.It can be used as a Balun of course but tapped pins are not necessary if you don't drive an active circuit through them..
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    Closed: Re: Need help on ADS inductor simulation

    But they are physically connected, you wanna separate the nets ?? I don't think so that is possible..
  7. Closed: Re: Is there possibility to force a filter topology in DA_LClowpassMatch in ADS?

    You cannot match over this bandwidth with simple few matching circuit.Load Impedance is not constant and varies by frequency..
    Is your intention to match these termination impedances ( both source...
  8. Closed: Re: How can i design defected ground structure in AWR ?

    Arrange the layers and associated materials and other stuffs in "Enclosure" box and make the "Bottom Boundry" being as Open.
    Then connect the Ports in according to this new arrangements..Ports...
  9. Closed: Re: Is there possibility to force a filter topology in DA_LClowpassMatch in ADS?

    Append to volker..

    Choose the Filter's Input Output Real Impedances carefully regarding to those impedances to be matched. Choose appropriate values so that matching circuit won't consist of weird...
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    Closed: Re: 1dB compression point and jamming signals

    Jamming sensitivity is not depended on P1dB Compression Point only ..Non-linearity ( in general speaking ) is figure of merit of an LNA but "the Modulation" is more important than this.
    Coding is...
  11. Closed: Re: Is there possibility to force a filter topology in DA_LClowpassMatch in ADS?

    There is no such definition as Matching Frequency in Filters.. Because Filters are not matching circuits.
    OK, If Input and Output Impedances are properly selected, the Filter may act as a kind of...
  12. Closed: Re: (ADS) There are no components in ADS after importing my PCB layout from Altium

    ODBC++ is not a proper way-especially from Altium- to import into ADS.Use simply Gerber format.. no pain..
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    Closed: Re: Integrated planar transformer

    I believe that the frequency is too low to couple two layers that are layed down on two different layers.So efficiency of a such transformer will be so weak..
  14. [SOLVED]Closed: Re: Questions about the definition of Z-matrix and Zin and Zout

    You confuse z-parameters and Input/Output Impedances of a 2-port.
    z-parameters are "open circuit parameters" and z11 is not equal to Zin ( or z22 is not equal to Zout )
    Pay attention to...
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    Closed: Re: RF connected/destroyed Load detector?

    So you should check the Load is connected well then you will turn on the PA, is that right ?? If it's so, I would use a switch to check the Load is well connected then this switch will rely the Load...
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    Closed: Re: RF connected/destroyed Load detector?

    But if the load is disconnected the PA will also be burned due to reflected waves from Open Circuit.. Take this account into..( I presume the PA has a capability to rive 50Vpp signal level..If the...
  17. Closed: Re: Parameters S12 Reverse transmission coefficient

    Imagine an amplifier..It has one input and one output port right ?? If you apply a signal to input port, you achieve amplified signal at the output.
    But if you apply a signal to output port, you...
  18. Closed: Re: Is there possibility to force a filter topology in DA_LClowpassMatch in ADS?

    Filters have only cut-off frequency definition,that's it..The Input/Output Impedances are constant( already defined ) along filter specification frequency..
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    Closed: Re: RF Power amplifier stability

    Parallel resistors are used at input/output or both..Consider also highpass/lowpass filter combination.
    There are numerous solution for the stability..
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    Closed: Re: RF Power amplifier stability

    The amplifier may oscillate-not definitely but-.If K<1, the amplifier is conditionally stable so certain load and source impedances may drift it into oscillation.If K<0, the amplifier will probably...
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    Closed: Re: Spacing Between PCB Pad and HEATSINK

    In order to prevent from electrical arcs , I'd recommend yo to use a adhesive insulator between heat-sink and capacitor pads.
  22. Closed: Re: Parameters S12 Reverse transmission coefficient

    "Quadripole" means 2-Ports right ?? So, since the antenna has one port only, there won't be S12 or S21 etc.It will have S11 only and the quality of the antenna is defined S11 only by s-parameters....
  23. Closed: Re: Is there possibility to force a filter topology in DA_LClowpassMatch in ADS?

    ADS Filter Design Guide does not accept complex load or source impedances. Therefore you should use a closer real impedance-for instance 10 Ohm-then place a simple matching circuit after.
    If you set...
  24. Closed: Re: Parameters S12 Reverse transmission coefficient

    S12 has no dependency on antenna or other RF devices.S-parameters are definitions that relate interrelation of the Ports of a system either antenna or amplifier..
    Can you post a sketch what you mean...
  25. Closed: Re: How to realize inductor from transmission line (micro-strip and CPW lines)

    CPW cannot be used for Inductor Realizations.Especially if the frequency is not sufficiently high, making an inductor by using Transmission Lines is not practical at all..
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