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metal layer forms the microstrip line in MMIC

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shanmei

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The paper 'A 60-GHz CMOS Receiver Front-End' from Behzad Razavi, it said that he uses the metal to form the microstrip line.

As in the bellowing figure, I am confused that in the chip layout, the metal 8 and metal 1 are far away, while in his figure, the metal 1 and metal 8 are touched together like a microstrip line.

How does the layout in the chip can achieve this by making metal 1 and metal 8 are connected together? Anyone has ideas?

Thanks.


1.png
 

I assume they are using a typical layer of silicon used in CMOS processes for dielectric, but I have no idea what properties those have as it was omitted from the paper. A critical part.
 
Yes, they hide this part. Thanks.
 

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