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Type: Posts; User: pancho_hideboo

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  1. Closed: Re: Recommend simulation software for RF simulation

    LTspice is enough for your purpose.
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    Closed: Re: Why S22 curve is like this

    Surely learn and understand following.
    https://www.edaboard.com/showthread.php?384656#4
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    Closed: Re: Why S22 curve is like this

    Not wrong at all.
    Simply due to Y12.

    Calculate Yout by hand from your small signal model of MOSFET.
    https://www.edaboard.com/showthread.php?385490#3
  4. Closed: Re: Oscillator jitter transient simulatin in spectre

    You can not understand Rj and DJ.

    Show me netlist portion regarding signal sources, analysis statements and option statements.

    Use PSS/TDnoise.
  5. Closed: Re: Oscillator jitter transient simulatin in spectre

    It seems you still think numerical error as noise.
    Conventional Transient Analysis never gives any device noise.

    Do you surely use Transient Noise Analysis ?

    Tighten “relref” and “maxstep”....
  6. Closed: Re: Oscillator jitter transient simulatin in spectre

    See https://designers-guide.org/forum/YaBB.pl?num=1209643110/3#3
  7. Closed: Re: Oscillator jitter transient simulatin in spectre

    No.
    It is simulation's artifact noises not jitter.
    As far as you use conventional Transient Analysis, you can never get jitter.

    Use Transient Noise Analysis instead of conventional Transient...
  8. Closed: Re: Output power, Drain Current versus multipliers

    Can you surely understand "Instance Multiplier" ?

    No.

    Can you surely understand "Impedance"and "Power" ?

    Show me your definition of input power.

    No.
    Surely consider operation point,...
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    Closed: Re: Verilog Coding in Cadence Vertuoso

    It has no meaning, unless you have layout view.

    You can copy and paste by ability of X-Window.

    If you would like to use other editor, e.g. emacs than vi editor, set it as Unix Environment...
  10. Closed: Re: How to reduce Harmonic Balance simulation time in Spectre

    Why do you set Oversample Factor =9 ?

    Can you understand Harmonic Balance Analysis ?
    Can you unsderstand a meaning of "Number of Harmonics" and "Oversample Factor" ?

    Show me your netlist...
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    Closed: Re: Extracting model for MOSFET

    Don't rely on such trivial video.

    You can not understand basic things at all.

    Small signal models are not useful at all.

    Surely learn basic things.

    I think you use bsim3 or bsim4 at...
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    Closed: Re: Extracting model for MOSFET

    No.
    Simply your simulation settings are not appropriate.

    Why do you set oversampling factor as 9 ?
    Can you understand Harmonic Balance Analysis ?

    Can you understand MOSFET model which you use...
  13. Closed: Re: How to reduce Harmonic Balance simulation time in Spectre

    No.
    This is a repeated instance.
    However if you generate layout from schematic, this generates same layout as multiplier.

    Surely consider physical device structure.
    They give different layout.
  14. Closed: Re: Looking for SPICE model for coupled lossy transmission line

    ”TLINE” is lossless model.
    So I don’t think it is possible with Berkeley Spice.
  15. Closed: Re: Looking for SPICE model for coupled lossy transmission line

    Use https://www.sp.se/en/index/research/emc/Sidor/LC-Calc.aspx
  16. Closed: Re: what is the significance of the transit frequency and maximum frequency of oscill

    See https://www.edaboard.com/showthread.php?354623-ft-of-a-transistor-non-existent-in-the-documentation/page2#32...
  17. Closed: Re: what is the significance of the transit frequency and maximum frequency of oscill

    No.

    Show me your power gain definition.
    Can you surely understand power gain ?

    No.
    fT is useful for frequency divider at most.

    Yes.
  18. Closed: Re: Real time plotting of radiation pattern using matlab

    Reload ‘hplane.txt’, every time after adding data.
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    Closed: Re: Application of Legendre Filter

    I compared filter characteristics of the followings.

    Butterworth : order=3, ωp=1.0, Ap=3dB
    Chebyshev Type I(Passband Ripple) : order=3, ωp=1.0, Ap=3dB
    Chebyshev Type II(Stopband Ripple) :...
  20. Closed: Re: How Device Resistance change with respect to W and L in any technoogy

    Surely learn and understand "Entry Mode" of resistor.

    It can never be.
    How can you enter value of L, while entry area of L is gray out in your figure ?
    You can not specify L, since your "Entry...
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    Closed: Application of Legendre Filter

    Do you know any actual application of Legendre filter ?

    https://en.wikipedia.org/wiki/Optimum_%22L%22_filter
    http://mathscinotes.com/2011/06/the-papoulis-filter-aka-optimum-l-filter/
  22. Closed: Re: Lamda equals to how many degrees on smith chart

    You can not understand very basic things at all.

    Consider V and I which are located at L=λ/2 separation.

    V(x=λ/2) = -V(x=0)
    I(x=λ/2) = -I(x=0)

    Phase differece for L=λ/2 is 180degree not...
  23. Closed: Re: Lamda equals to how many degrees on smith chart

    Surely learn Oneway-Trip and Round-Trip.
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    Closed: Re: butterworth and chebyshev filter

    Consider coefficients of polynomials.
    Calculate S11 from S21.
    Then calculate Zin.
    Then evaluate g-parameters by continuation fraction expansion of Zin.
    See...
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    Closed: Re: butterworth and chebyshev filter

    Definition of Chebyshev polynomials.

    (3.24) is due to complex conjugate pair of poles.

    (3.25) is from (3.7).
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