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Type: Posts; User: kunalsan

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    Closed: How to convert excel file to .json file

    Please help me regarding creating .json file using a excel file
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    Closed: method of phase noise calculation of PLL

    Hello
    I am designing an Integer N PLL. For the phase noise of the entire PLL, which method is more efficient.
    1. By using PSS and PNoise simulation in spectre
    or
    2. By using MATLAB code in which...
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    Closed: Re: PSS convergence in PLL simulation

    ok, I will try with 1msec and update you with the result
    netlist:-
    simulatorOptions options reltol=1e-3 vabstol=3e-5 iabstol=1e-11 temp=25.0 \
    tnom=27 multithread=on scalem=1.0 scale=1e-6...
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    Closed: Re: PSS convergence in PLL simulation

    fout frequency at
    50us : 2431.3MHz
    100us : 2433.5 MHz
    150us : 2433.5MHz
    200us : 2433.2MHz
    250us : 2433.3MHz
    300us : 2434.9MHz
    350us : 2434.4MHz
    400us : 2435.1MHz
    450us : ...
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    Closed: Re: PSS convergence in PLL simulation

    the waveform after 500us transient simulation are https://imgur.com/a/B8h8KaZ
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    Closed: Re: PSS convergence in PLL simulation

    Thank you for your kind consideration.
    I will reply to you after doing what you have suggested to me.
    yes, the comparison frequency (reference frequency) is 19 MHz and the divider ratio is 128 (...
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    Closed: Re: PSS convergence in PLL simulation

    Please suggest me the type of analysis, to verify the PLL.
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    Closed: Re: PSS convergence in PLL simulation

    After lock time, the VCO output frequency has some spurs due to the nonlinearity of the charge pump. I think this is the reason. please correct if I am wrong.https://imgur.com/YXkq61K
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    Closed: Re: PSS convergence in PLL simulation

    Actually, I have changed the loop capacitor value. Please suggest me the required condition for PLL to be locked.
    https://i.imgur.com/JhiPlzh.png
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    Closed: Re: PSS convergence in PLL simulation

    yes, the VCO output frequency in locked condition after 2 microseconds is 2440MHz.
    The x-axis in that plot is transient simulation time. I have plotted that graph by the calculator in cadence...
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    Closed: Re: PSS convergence in PLL simulation

    output frequency plot
    https://imgur.com/JhiPlzh
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    Closed: Re: PSS convergence in PLL simulation

    I have done a transient analysis of PLL. The reference waveform and divider output waveform is in the figure. Both are in-phase, it shows the PLL is in the locked condition.
    https://imgur.com/297rU3R
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    Closed: Re: PSS convergence in PLL simulation

    sorry for late reply
    VCO output and DIvider output are

    151114

    151115
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    Closed: Re: PSS convergence in PLL simulation

    Actually, I am new in the PLL design. can you please give me the correct PSS setting regarding my work. It will be very helpful for me.
    I have attached the transient behaviour of frequency and...
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    Closed: Re: PSS convergence in PLL simulation

    after changing fundamental frequency to 19MHz, PSS convergence problem is still present.
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    Closed: Re: PSS convergence in PLL simulation

    yes, I have changed fundamental frequency to 19MHz.
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    Closed: Re: PSS convergence in PLL simulation

    the netlist for PSS simulation is:-

    simulatorOptions options reltol=1e-3 vabstol=3e-5 iabstol=1e-11 temp=25.0 \
    tnom=27 multithread=on scalem=1.0 scale=1e-6 gmin=1e-12 rforce=1 \
    ...
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    Closed: Re: PSS convergence in PLL simulation

    Hello,
    yes, I am designing an Integer-N type PLL.
    The netlist and PSS setting are given below.
    PSS setting snapshot:-
    151010
    151008
    151009

    netlist:-
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    Closed: PSS convergence in PLL simulation

    hello,
    I am trying to design a type-2 charge pump PLL. but there is a problem with PSS simulation in cadence spectre simulation. I am designing PLL with the 19MHz reference frequency and VCO...
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