Decoupling of Passive Components at W Band in MMWave Silicon Layouts

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Puppet123

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Hello,

If I am doing MMWave Layouts say in BiCMOS, at W Bands (75-85 GHz) why would I use Decoupling capacitors (1 pF or 500 fF) placed at the end of every parallel passive component (inductors, capacitors or t-lines) to provide a low-impedance AC ground ?

Would I do this below W Band ?

Thank you.
 

Your question not clear to me..
Decoupling is used to connect a "live" node to GND.Can you expand your question ?
 

Hello,

Thank you for your response.

See attachment below from this paper:

S.T. Nicolson, P. Chevalier, B. Sautreuil, and S.P. Voinigescu, “Single-Chip W-Band SiGe HBT Transceivers and Receivers for Doppler Radar and Millimeter-Wave Imaging,“ IEEE Journal of Solid-State Circuits, Vol.43, No.10, pp. 2206-2217, October 2008.
 

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Obviously, this does not refer to the signal path. You don't want to ground the signal path.
 

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