MMIC design_LNA _how to form the microstrip line with metal layers

[shanmei]

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.

 

[tony_lth]

metal8 is for signal, metal 1 is for GND, no substrate between them?

 

[BigBoss]

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.

View attachment 108523

There should be a complex substrate between M1 and M8 but the author ignored to show the details in his figure in order to simplify it.

 

[shanmei]

Oh, perhaps it has some material between them. Thank you for mention it. I will check.