CPW width and gap for LNA design

I am designing a LNA using CPW. I have used the W=60um and G = 40 um and obtained my perfect results in simulation.

But does this W/G i have used, can create problem during layout. I have to keep my chip size within 1.5x1.5 sqr mm

Hello,

It all depends upon what impedance you want!, which frequency your operating, & substrate material used ! & most importantly with/without Ground?

Do the calculations using the TXLINE calculator from AWR which is free...
Then simulate using Sonnet Lite electromagnetic simulator which is also free to get exact impedance & results for your CPW structure...

http://web.awrcorp.com/Usa/Products/...ducts/TX-Line/

http://www.awr.tv/#videoId=7998648

http://www.sonnetsoftware.com/products/lite/

---manju---

Thanks for the reply. I need 65 ohms at 30 GHz. I have simulated that using ADS and W=60 and G=40 gives me that.

I also want ground. Is ground area dependent in the W/G size and can my W/G values lead to very large ground area. Any book with this info will be helpful.

Hello,

Then use any CPW calculator or circuit simulator but make sure you cross verify the same with electromagnetic simulator as equations or analytical models are not good at this frequency...

I don't remember good books but I can provide you very good / excellent data available from sonnet from where I learnt CPW...

Here you go

http://www.sonnetsoftware.com/suppor...r_waveguid.htm

https://www.edaboard.com/ftopic384784.html

---manju---