[w5eeg]

I have written two Octave files (my first Octave project) to compute Lowpass- and Bandpass-Mode time domain transforms.  See the slides posted here . I have wondered how to do this for decades.  In 2012, I bought Joel Dunsmore’s book which explained how to do it.  Seeing this post from SM6PGP motivated me to work on it.  Thanks !

-roy, w5eeg

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   screenshot.png
   

[w5eeg]

Maybe R10 is the problem?  I have deactivated it in the attached screenshot.

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   ckt_2.png
   

[w5eeg]

My mistake, Q2 looks correct, and I had not included Q4. When included, there is the problem you described.

[w5eeg]

I think the only problem is the output MOSFET needs to be reversed so that the P-channel source is connected to the 12 volt supply.  Attaching a uSimmics schematic screenshot.

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   ckt_in_uSimmics.png
   

[w5eeg]

There is a very helpful calculator and equations for conductor-backed edge coupled coplanar waveguide given by Takayuki Hosoda at http://www.finetune.co.jp/~lyuka/technote/cbcpw/edge-coupled-cbcpw.html .  I have made a subcircuit for the coupled line shown in the attached screenshots.

 

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   subcircuit_E-CPWG.png
   

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   symbol_E-CPWG.png
   

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   test_ECPWG.png
   

[w5eeg]

Why not just have an equation for width=WH * 1.6 mm and Sweep WH ?

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