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For LNA design, how to get the transistor size (BJT) for the Ropt?

I have started using SpetreRF recently and would like to know how to determine the length of the emitter of a BJT in order to have an optimum noise resistance Ropt equal to the resistance of the source Rs, e.g. 50 ohms.

-How this can be achieved through the simulation of Gopt and Bopt

-How this can be achieved through a simulation of Gmin

I will be interested to know about application notes that are available on the topic

Regards, Aba

Tawna over 11 years ago

Hi Aba,
If you are new to SpectreRF, the first thing I recommend you do is go through Simulating Low Noise Amplifiers section of Appendix A of the SpectreRF User Guide. You will need to have an account on Cadence Online Support (http://support.cadence.com) to download the gpdk180 required to simulate the designs in the workshop.
http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:DocumentViewer;src=pubs;q=/spectreRF/spectreRF12.1.1/AppA.html
More information on the various workshops is in this blog on the Cadence Community website:
88%
SpectreRF Tutorials and Appnotes... Shhhh... We Have a NEW Best Kept Secret! - RF Design
best regards,
Tawna
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bimana over 11 years ago

Dear Tawna,
Thank you for your response. I have some documents, including the document on LNA's. I dont have yet the kit for simulations related to the workshop. I have time constraints and a quick indication on the best method to determine the length of the emitter of a BJT with SpectreRF will be appreciated,
Best Regards, Aba
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