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  1. Closed: Re: Diagonalization of Impedance Matrix

    Thanks for very good example.

    Why is a diagonalization impossible in this frequency ?
    What does this frequency mean?
    This frequency is twice of 3-dB cutoff frequency.
  2. Closed: Re: What is the cutoff frequency of the capacitively loaded Transmission line

    What quantity do you see in simulation ?
  3. Closed: Re: What is the cutoff frequency of the capacitively loaded Transmission line

    So large mismatch at port, although I don't know what you set for "mtline".
    What quantity do you see in simulation ?
  4. Closed: Re: What is the effect of power match on S11 and S22 in a PA

    What do you want to mean by "good" ?

    What do you want to mean ?

    What do you want to mean by "good" ?

    Wrong.

    Can you understand operation class of PA ?
    There are many operation class for...
  5. Closed: Re: What is the cutoff frequency of the capacitively loaded Transmission line

    Generally wrong, although I don't know what book you read.

    Your circuit is well-known capacitive discontinuity in uniform line.

    What value do you set for reference impedance of ports ?
  6. Closed: Re: Problem in saving data during DC sweep simulation in Cadence Virtuoso

    OCEAN is not required.
    OCEAN is no more than an assistant of generating netlist.

    Excecute simulation from netlist directly as same as HSPICE.

    Modifying netlist manually.
    You can never utilize...
  7. Closed: Re: Simulating the input capacitance of digital instance

    Use PSS/PAC with clock instead of AC.
  8. Closed: Re: Simulating the input capacitance of digital instance

    Assume rectangular pulse as clock.
    Cin is different for low level, high level, rising edge and falling edge.

    What Cin do you want to evaluate ?

    Average Cin over one period of clock ?
    Or...
  9. Closed: Re: Simulating the input capacitance of digital instance

    Transient signal has no meaning in AC analysis.

    I assume you use Cadence Spectre.

    If you would like to evaluate AC capacitance at specific time point, use transient analysis with setting...
  10. Closed: Re: Simulating the input capacitance of digital instance

    I don’t think a method using transient analysis is required.
    See https://www.edaboard.com/showthread.php?354680#12
  11. Closed: Re: Simulating the input capacitance of digital instance

    Simply do AC analysis.
  12. Closed: Re: Problem in saving data during DC sweep simulation in Cadence Virtuoso

    I don't think so.

    Both ADE-XL(GXL) and ADE-Explorer have very large over head.
    So multiple sweep simulation speed is very slow compared to Spectre's native sweep ability.

    See "spectre -h...
  13. Closed: Re: Diagonalization of Impedance Matrix

    [P, D] = eig(Z)


    (Case-1)
    Z = [1, j; j, 1]
    Z : Symmetric=1
    Z : Hermitian=0
    Z : Skew-Hermitian=0
    Z : Orthogonal=0
    Z : Unitary=0
  14. Closed: Re: Dynamic Comparator noise using spectre transient noise analysis

    Use time domain noise analysis of PSS/Pnoise.
    Then integrate noise spectrum over 0-fs/2.
    Here you have to set a decision time.
  15. Closed: Re: How to find cutoff frequency of the circuits

    Simply calculate voltage transfer function.
    Then evaluate cutoff frequency by symbolic math tool such as Mathematica, Maple, Maxima, Symbolic Math Toolbox in MATLAB, etc.

    Or use SapWin....
  16. Closed: Re: Diagonalization of Impedance Matrix

    Z = [2, j, 0;
    j, 2, j*2;
    0, j*2, 2]

    This [Z] is neither Hermitian, Skew-Hermitian nor Unitary, yet it is Symmetric and Normal.
    This [Z] can be diagonalized by Orthogonal...
  17. Closed: Re: Diagonalization of Impedance Matrix

    Not useful at all.
  18. Closed: Re: Diagonalization of Impedance Matrix

    I know such very basic thing.

    No. [Z] is not a Hermitian matrix.

    Here [Z]T means transpose of [Z], [Z]+ means conjugate transpose of [Z].

    For lossless reciprocal circuit, [Z] is a pure...
  19. Replies
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    251

    Closed: Re: how to get higher P1dB,in point

    High bias current and low load impedance.
  20. Replies
    9
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    674

    Closed: Re: Loadpull for Differential PA

    Can you understand differential circuit ?
    https://www.edaboard.com/showthread.php?386764#2

    No. There is no coupling between L.
    Can you understand actual transformer ?

    Ideal transformer is not...
  21. Closed: Re: Problem in saving data during DC sweep simulation in Cadence Virtuoso

    Show me netlist when you invoke parametric sweep.
  22. Closed: Re: Problem in saving data during DC sweep simulation in Cadence Virtuoso

    DC Analysis is not required.

    Simply do parametric sweep for AC analysis from Cadence ADE.
    Or enclose ac analysis statement by sweep statement in netlist.
  23. Closed: Diagonalization of Impedance Matrix

    Generally an impedance matrix [Z] is a complex symmetrical matrix.
    It is neither a real symmetrical matrix nor a Hermitian matrix.

    However a complex impedance matrix [Z] can be diagonalized.
    I...
  24. Closed: Re: Too large .psf file generated by Post layout simulation using Spectre

    I can not understand what you want to mean at all.
    Describe correctly.

    Show me netlist.
    Here I don’t require circuit description.
  25. Replies
    5
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    502

    Closed: Re: Impedance Calculation

    Drive by current source of known value.
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