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

    How do I tell if the textbook example is using T configuration or Π configuration ?

    https://i.imgur.com/yMgSq9N.png
  2. Closed: Re: microstrip low pass filter design issues with sonnet

    ok, now I wish to re-design the microstrip low pass filter at lower cutoff frequency at 100MHz, so that I could fabricate the PCB and do the actual PCB testing.

    Any advice ? The design equations...
  3. Closed: Re: microstrip low pass filter design issues with sonnet

    Height changes ? Huh ? Why so ?





    No, using coefficient of 10.8 also gives a sharp notch on S11 curve.

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

    Huh ? I thought the box is of the same planar direction of the microstrip filter ?

    Did I misunderstand the concept of height ?
    And what is the actual purpose of box size ?



    By the way, I...
  5. Closed: Re: microstrip low pass filter design issues with sonnet

    If I use 30mm for the 'Air' layer, it throws the box resonance warning. Why the same warning disappear for 20mm for 'Air' layer ?


    Run 1: Sat Jun 22 21:59:35 2019. SL291418.107194.
    Em...
  6. Closed: Re: microstrip low pass filter design issues with sonnet

    @BigBoss

    Thanks for your tips. They help to make it more like a low-pass filter now.

    However, I am confused with the layer configuration.

    Does the following layer configuration makes sense ?...
  7. Closed: microstrip low pass filter design issues with sonnet

    I am trying to replicate the microstrip low-pass filter in SonnetLite from the book by Jia-Sheng Hong - Microstrip Filters for RF Microwave Applications, 2nd Edition (Wiley Series in Microwave and...
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    Closed: Re: Ripple-borrow binary subtraction circuit

    What are you comparing transmission gates to ?
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    Closed: Ripple-borrow binary subtraction circuit

    How does this patented ripple-borrow binary subtraction circuit eliminate the need for doing two-complement conversion on the input, thus saves on hardware circuit computation area and time ?
    ...
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    Closed: Re: Marchand balun layout

    How to derive the expressions involving Ya, Yb, Zoe,Zoo ?

    And why need to increase Zoe/Zoo impedance ratio ?
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    Closed: Re: Marchand balun layout

    How do we see from the following expressions that even-mode to odd-mode impedance ratio is very important for balun ?

    https://i.imgur.com/GPka53A.png
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    Closed: Re: Marchand balun layout

    Yes, I am now trying to replicate planar layout of marchand balun on PCB using SonnetLite instead.

    This book Microstrip Filters for RF Microwave Applications has some good examples (maths theory +...
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    Closed: Re: Unknown xx req signal for NoC coding

    Now, I am facing another unknown x problem for 'enqueue_en' signal.

    why removing "flit_data_input_are_valid[port_num]" from enqueue_en logic solved the strange, unknown x for 'enqueue_en' signal ?...
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    Closed: Re: Unitary property of scattering matrix

    @pancho_hideboo

    For ideal lossless case:

    transmitted power + reflected power = source power

    So, divide the whole expression just above by source power, we have the following:

    |S21|^2 +...
  15. Closed: Re: Derivation for ABCD matrix of backward-wave directional couplers

    Wait, how do you arrive at this conclusion ?
  16. Closed: Derivation for ABCD matrix of backward-wave directional couplers

    How to derive the ABCD matrix for the following backward-wave directional couplers ?

    Note: I could not locate Table 2.2 in the book

    https://i.imgur.com/digBJPP.png
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    Closed: Re: Frequency Divider Circuit issue

    For other interested readers, see explanation given here

    https://i.imgur.com/uk1UXme.png

    https://i.imgur.com/BA4SKXN.png

    - - - Updated - - -

    I just came across the following circuit (c)...
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    Closed: Re: Frequency Divider Circuit issue

    Compared to the frequency divider, there is no feedback loop in the following circuit (A CMOS IC implementation of a dynamic edge-triggered flip-flop with reset). Why ?
    ...
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    Closed: Re: Frequency Divider Circuit issue

    Razavi's document stated that this is a THREE-stage master-slave flip-flop.
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    Closed: Re: Frequency Divider Circuit issue

    How does this three-stage master-slave flip-flop using TSPC logic works as a frequency divider (÷2) ?
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    Closed: Re: Marchand balun layout

    Someone else told me to replace CLIN with 2 Symmetrical Coupled Microstrip Lines (MCP) and then use linecalc to get the correct length and width.

    What do you think about this idea ?
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    Closed: Re: Unknown xx req signal for NoC coding

    Problem solved.

    https://gist.github.com/promach/cf3ae626a85badad6cd822d3107c86b7/revisions#diff-7d0a6c3024f080f56a53770135bf21ab

    Just change

    (.clk(clk), .reset(reset),...
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    Closed: Marchand balun layout

    For this marchand balun schematics in ADS, how to instruct the ADS layout generator to use coil shape (for area saving in IC) ?

    Besides, anyone have any experience with planar layout of marchand...
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    Closed: Re: Unknown xx req signal for NoC coding

    No, you are looking at the wrong req.

    See rr_arb_vc_to_cpu module instantiation instead
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    Closed: Unknown xx req signal for NoC coding

    I am having unknown xx for req[1:0] signal in a NoC verilog code implementation

    Please advise.

    https://i.imgur.com/uw2hSak.png

    // a single node within the Spidergon

    module...
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