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Recent content by brookning

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    frequency meshing in ADS momentum

    Sometimes the layout maybe quite complicated. In that case, I think whether the mesh density is dependent to freq or not, it is helpful to increase the number of density, by sacrificing simulation time.
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    An old question, a large signal simulation (LSSP) for MIXER in ADS

    Hello there, Firstly, I find in the tutorial of mixer design in ADS help document, no LSSP controller is used. Secondly, I notice that in the LSSP help, it mentions that at the Large Signal Port, like a mixer, a voltage source should be deployed for some reasons. So that, I tried to use a...
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    regarding upconversion mixer

    why don't u sweep the LO input power with a low enough IF power? Then u can see when ur LO input power saturated
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    how to design the PAD in a MMIC?

    Hello my friends, I am wondering how to reduce the impact from PADs in a MMIC design. I find when I complete all layouts without Pads, I can achieve very good VSWR. However, after I add the pads, the response deteriorates and the central frequency move several GHz. I have tried many sizes of...
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    Looking for references and tutorials to HEMT MMICs

    Hello there, I am studying HEMT MMIC design and I find I really need to know the behaviors of HEMTs, like the bias, and large signal characteristics, and everything I feel. :P I know something about CMOS, but have no idea about HEMT. Do they behave similarly? Does HEMT work in the forward bias...
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    When to use a single VCO

    Thanks to all of you. :)
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    When to use a single VCO

    Thanks, Chang. So how those systems, where the alone VCO structure is adopted, avoid the unstable problems you mentioned? Or in other words, what kind of applications could suffer those unstable problems?
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    When to use a single VCO

    Hello there, I have a question when to use a single VCO in the real world? I read lots of materials and I find it's popular to use PLL as LO or frequency source. However, I think since the VCO has a tuning range and it is able to be tuned to a indicated frequency point, why the writers of those...
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    The Definition of 2LO to RF Isolation

    If so, the isolation should be high enough no matter what situation it is used in? I simply design a subharmonic mixer but find the power of 2LO at the input is very close to the input signal power. Is there any mixer working with poor iso in the real world?
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    The Definition of 2LO to RF Isolation

    Hi jiboune Thank you for your reply. I wonder where to measure the 2LO signal power? Because there may be some other stuff like buffers following the mixer core. Do you mean I pick up the 2LO power at the output port, which is also one of the output spurs, right? In the case you gave, the 2LO...
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    The Definition of 2LO to RF Isolation

    Hello, there, I have a question that within the subharmonic mixer, what is the definition of 2LO to RF isolation? I see the LO to RF isolation is calibrated by LO@RF/LO@LO. What about 2LO? Thanks a lot.
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