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Type: Posts; User: promach

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  1. Closed: Re: Understanding Linear implementation of a round-robin arbiter

    What is the actual purpose of the chain of fixed-priority cells F in figure 2.3 ?

    How does this chain actually help to eliminate the circular loop logic as described in the paper itself ?
    ...
  2. Closed: Re: Determine whether a binary number is of power of two in verilog code

    20 = 1

    So, in[0] could have the value of 1

    Note: I am trying to detect one-hot as mentioned in post #1
  3. Closed: Re: Understanding Linear implementation of a round-robin arbiter

    @std_match

    What is wrong with my verilog code implementation that resulted in wrong waveform result ?

    https://i.stack.imgur.com/uGFct.png


    module arbiter2 #(parameter WIDTH = 4) (clk,...
  4. Closed: Re: Determine whether a binary number is of power of two in verilog code

    @ads-ee

    The following will also work, with less LUTs and higher fmax compared to the solution above.

    always @(*) is_power_of_two = ((in[7] + in[6] + in[5] + in[4] + in[3] + in[2] + in[1] +...
  5. Closed: Understanding Linear implementation of a round-robin arbiter

    For Efficient microarchitecture for network-on-chip routers , do anyone know how this round-robin arbiter actually works ?


    Note: The corresponding verilog codes seem to be located at...
  6. Closed: Re: Determine whether a binary number is of power of two in verilog code

    The solution is to use


    always @(*) f = (v != 0) && ((v & (v - 1)) == 0);


    Someone suggested me to use power_of_two = ^v which is so much simpler.

    Any comment ?
  7. Closed: Re: Determine whether a binary number is of power of two in verilog code

    See the verilator linting output with is_power_of_two.v


    verilator -Wall --lint-only is_power_of_two.v
    %Warning-WIDTH: is_power_of_two.v:6: Logical Operator LOGAND expects 1 bit on the LHS, but...
  8. Closed: Determine whether a binary number is of power of two in verilog code

    I am trying to determine whether a binary number is of power of two (in other words, is it of one-hot encoding).

    I found a method to do so, but it is for integer.

    Could anyone help to transform...
  9. Replies
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    Closed: Re: Derivation of Marchand Balun equations

    Analysis and design of impedance-transforming planar Marchand baluns talks about the derivation process, but it is still not complete.

    We still need to derive equation (1) of the paper.
  10. Closed: Re: HFSS port 'Port1' does not have a valid reference plane above or below it.

    See https://github.com/promach/planar_marchand_balun

    I suppose I made mistake in the width of the coupled microstrip (W=2mm) in terms of ports impedance of 50 ohm ??
    ...
  11. Replies
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    295

    Closed: Derivation of Marchand Balun equations

    Could anyone advise about derivation of Marchand Balun Equations ?

    Note: Screenshot below is taken from paper :

    New Design Formulas for Impedance-Transforming 3-dB Marchand Baluns

    ...
  12. Closed: Re: microstrip low pass filter design issues with sonnet

    Could you post the ADS linecalc window screenshot which shows 120° ?
  13. Closed: Re: microstrip low pass filter design issues with sonnet

    Someone else told me the above.

    What do you think ?
  14. Closed: Re: microstrip low pass filter design issues with sonnet

    Is it possible to prove this mathematically using some microstrip expressions ?
  15. Closed: Re: microstrip low pass filter design issues with sonnet

    I am trying to understand why open-circuited stub has a better S21 response compared to stepped impedance according to the result at figure 5.4 below:

    this microstrip equation for Zo does not...
  16. Closed: Re: microstrip low pass filter design issues with sonnet

    See https://github.com/promach/low_pass_filter

    By the way, what is the difference between open-circuited stub and stepped-impedance ?



    See 2GHz Microstrip Low Pass Filter Design with...
  17. Closed: Re: microstrip low pass filter design issues with sonnet

    I have added a polygon covering the entire box region at the GROUND layer.

    However, I am not sure if I have actually added a ground metal plane.
    I could not see the ground plane using 3D viewer...
  18. Closed: Re: microstrip low pass filter design issues with sonnet

    I have inserted the feedline as shown in the figure below. May I know how to generate a DXF layout file (without the extra feedline structure) for actual manufacturing purpose ?

    By the way, is...
  19. Closed: Re: Deriving admittance matrix for shortened quarter-wavelength transmission line

    For equation (1) , I am trying to use MATLAB y2abcd() function to convert admittance matrix to ABCD matrix.

    However, I am getting mismatch between MATLAB answer and actual theoretical result.
    ...
  20. Closed: Deriving admittance matrix for shortened quarter-wavelength transmission line

    For Reduced-size branch-line and rat-race hybrids for uniplanar MMIC's , how to derive equation (2) ?

    and is the imaginary constant j needed in equation (1) ?

    https://i.imgur.com/Y32GkzC.png
    ...
  21. Closed: Re: microstrip low pass filter design issues with sonnet

    What do you exactly mean by reference plane shift ?
  22. Closed: Re: microstrip low pass filter design issues with sonnet

    Someone told me the above with regards to the two extra rectangles nearest to the ports.

    What do you guys think ?

    What about in HFSS ?
  23. Closed: Re: microstrip low pass filter design issues with sonnet

    Why does Z0 of a microstrip line depends on W but not L ?

    https://i.imgur.com/PBsnQTv.png
  24. Closed: Re: microstrip low pass filter design issues with sonnet

    I know, but do you notice the two extra rectangles (which do not have any designated length and width dimensions) nearest to the ports ?

    https://i.imgur.com/n422Rvv.png
  25. Closed: Re: microstrip low pass filter design issues with sonnet

    For the two ports (which are allocated two rectangle patches), I know I can use PCB calculator, but how do I decide the input and output impedance of the microstrip transmission line ?

    Is VNA...
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