Hello everyone, I am working on designing a self interference cancellation low noise amplifier (SIC LNA). I want to embed on wafer probes for testing. Is it possible to remove the passivation layer inside the core area for on chip probing. If yes, how can i do this in magic layout?? Regards Mudassir Ali Team lead Pakistan 6 @Boris Murmann @Tim Edwards

In magic, draw layer

glass

over metal5. The

glass

layer marks the passivation opening.

Alright, Thank you

@Mudassir Ali Hi Mudassir, I am also working with LNA for our wireless transceiver. If possible can you please tell me how did you figure that your LNA is working? Did you simulate in ngspice? which parameter/plot did you check?

@Mohammad Farhan, i am working on an inductor less SIC LNA for sub 6 GHz band of 5G. Till now i have simulated the schemtic in xschem which uses ngspice simulator. Till now I have plotted the input return loss, noise figure, gain etc and have also checked its self interfence cancellation at multiple frequincies.

@Mudassir Ali I am pretty new with this RF stuffs. How did you plot those parameters like input return loss, noise figure, gain? Can you please share which command you used for this? I tried to find these s-parameters though ngspice. I followed the 17.9 section from ngspice documentation but did not get anything significant. It would be great if I get something from you.

This is the script i am using to plot the gain, S11(input return loss), input impedance and noise figure. Where vo2 is the output node, vi is input node and VIN4 is input supply

thank you so much. This actually worked for me. I should have tried to use the formulas to find those parameters earlier like you.